Question: How many players are featured on a MLB team's active roster?
About the article "Baseball", section "Player rosters".

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Each Major League Baseball team maintains both a 25-man roster and a 40-man roster of players.
Players on the 25-man roster are eligible to play in official major league games throughout the season.
The 40-man roster includes the players on the 25-man roster plus as many as 15 players who are either on the team's 7- or 15-day disabled list (see below), who are on paternity leave for up to 3 days, or who are in the team's minor league system.
From September 1 through the end of the regular season, any player on the 40-man roster (also referred to as the "expanded roster") is eligible to play in an official regular season game.
Many young players make their Major League debuts in this way, as "September call-ups.
"To be eligible for a team's postseason roster, a player must be on any of the following: (a) the active 25-man roster (b) the disabled list, (c) the bereavement list, or (d) the suspended list as of August 31 at midnight ET.
The only exception is that a player who is on the disabled list at the end of the regular season may be replaced on the postseason roster by any other player who was in the organization on August 31, with the approval of the commissioner of baseball.
A postseason roster is a fully expanded roster and can have an unlimited amount of players.
Any player who has appeared in or played at least one game in the majors for that team regardless of spending a brief amount of time in the minors will be called up from the minors to be on the postseason roster.
All players on the final roster of the team's season will be eligible to receive a World Series ring after the team wins the World Series. 
 The official list of players who are eligible to play in a given game and to be included on the lineup card for that game.
Major League Baseball limits the regular-season active roster to 25 players during most of the season, but additional players may be on the disabled list, and the roster can be expanded to as many as 40 active players after August 31st by bringing up players on the 40-man roster.  
A disaster draft or contingency draft is a procedure developed by professional sports leagues to rebuild a team's roster if many players are disabled or killed. 
Major League Baseball's disaster plan is covered in Rule 29 of its official rules.
The plan is triggered by an event causing the death, dismemberment, or permanent disability of at least five players from a team's active, disabled, or suspended roster during a season (including the playoffs), or at least six players during the off-season.
Major League Baseball's commissioner will decide if the disabled club can continue play, in consultation with the MLB Players' Association and the club.
The commissioner can hold a restocking draft to allow the disabled club to select as many players as it lost, with the restriction that no more than one player can be selected from each team.
Each of the non-disabled teams makes five players available for the draft taken from its active list (or if during the off-season, from its reserve list), composed of one pitcher, one catcher, one outfielder, one infielder, and one more player of any position, subject to adjustments by the commissioner based on the players lost by the disabled club.
If a team has fewer than three eligible catchers, it does not have to provide a catcher to the draft.
The non-disabled teams also are required to make available as many players with 60 or more days of Major League service time as of 31 August of the season preceding such draft as the number of such players lost by the disabled team.
Any player with no-trade rights with regards to the disabled team may not be made available unless the player waives the right.
The commissioner and Players' Association can also agree upon other appropriate relief for a disabled club.
Major League Baseball's first expansion drafts of the early 1960s were based largely on the procedures first set out for the disaster draft. 
 Active list - Also called the active roster, the 25-man is composed of 25 players who are playing for their Major League team.
They are the starting eight position players, pitchers, and reserve players on the team.
Players on the active roster are also on the 40-man roster.
These players are generally the only ones who dress in uniform and are the only ones who may take the field in a game at any time.
Typically, only players on the 25-man roster, and players who are on the disabled list but were on the 25-man roster, travel on road trips with the Major League team.
Reserved list - Defined in Major League Rule 2, the 40-man roster is also known as the Major League Reserve List.
This name hearkens back to baseball's past when teams reserved the rights to a number of their players, making it impossible for any other team to sign those individuals.
In time, a team's reserve list was expanded to all players under contract to that team until the player was released (potentially never).
In the 1970s, free agency allowed players achieving certain conditions the opportunity to leave their original team.
The system has undergone further changes since then, but there are still players under reserve from year to year on each team.
Those players include most minor leaguers and, you guessed it, players on the Major League Reserve List.
Bereavement list - Major League players may be placed on the bereavement list due to severe illness or death of that player’s or his spouse’s immediate family.
Minimum period is 3 days, maximum 7 days.
Players on this list are counted towards the Reserve List Limit but not the Active List Limit.
Designated List - When the Active or Reserve List Limit has been reached for a particular club, and the club desires to add an additional player, one player from that club must be designated, meaning giving notice to the Commissioner to release or assign that player within 10 days.
Such players do not count towards the player limits, but cannot participate until release or assigned.
Disabled list - 15-Day: The player must remain off the active roster for a minimum of 15 calendar days, starting on the day following the player’s last game.
60-Day: Same rules apply, however, this may only be used when the team’s 40-man roster is full.
Any player placed on the 60-day disabled list after August 1 may not play for the remainder of the season, including any post-season game.
Emergency Disabled list - Maximum number of players on list at one time-no limit.
Minimum period of inactivity-sixty (60) calendar days.
Players placed on this list after August 1 shall remain there for the balance of the season.
This list may only be used when a club is at the maximum limit of 40 players.
Disqualified list - Players who violate their player contract.
Players on this list do not count towards the Reserved List or Active List limits.
A player may remain on this list for two consecutive years before he is removed.
A player who is "Disqualified" is deemed "suspended" on the official MLB transaction report.
Ineligible list - Players found guilty of serious misconduct (gambling, tanking, bribery, violence to umpires).
Players on this list do not count towards the Reserved List or Active List limits.
A player may remain on this list for two consecutive years before he is removed.
Military list - Players with definite orders to report for military service.
Players on this list do not count towards the Reserved List or Active List limits.
Upon learning that a player has separated from military service, a team must immediately notify the Commissioner.
Restricted list - Players who fail to report within 10 days of the season, or who fail to come to a contract with the team prior to that time.
Players on this list do not count towards the Reserved List or Active List limits.
A player may remain on this list for two consecutive years before he is removed.
Often, placing a player on the Restricted List is akin to releasing him without fully relinquishing his rights.
Suspended list - A player may be suspended by his club or the league for insubordination, misconduct, or failure to report in playing condition.
A player on this lists counts both towards the Reserve List and the Active List limits.
Temporarily inactive list- Players not able to render active service due to: (1) necessary temporary absence due to family member’s illness; (2) absence excused for personal obligations; or (3) awaiting release for the purpose of allowing the player to sign with a foreign league.
Minimum placement is 3 days.
Players on the TIA count towards the Reserve List limit but not the Active List limit.
Voluntarily retired list - A player under contract who retires is placed on the Voluntarily Retired List.
If a player desires to return, he may not be reinstated until 60 days after the season in which he retired.
He may also not play baseball elsewhere without obtaining consent from the club owning his rights.
Players on this list do not count towards the Reserved List or Active List limits.
A player may remain on this list for two consecutive years before he is removed.