You’ll often get help in the form of additional money as an incentive to sign up for an account. That may mean free money to play with as a bonus, although not all game types have this. Those that do –online poker, online casinos, slots games, bingo, and lotteries are all good examples– will present versions of these offers mainly for new first-time depositors but occasionally for regular players.
Casino bonuses, in particular, are very often highly valuable and will add to your dollar, GBP, or Euros bankroll.
Just note that if you win after accepting a bonus offer, there will be rules and criteria in the terms and conditions that prevent you from withdrawing those winnings to ensure the operator has had a chance to get them back. This is known as play-through and is a price you must pay where bonuses are concerned.
Accepting a bonus may not be as good for your wealth as it first seems, but if you’re playing more as a form of entertainment, getting a bonus offer is nearly always a no-brainer.