It is made up of servers, clients or workstations, a network operating system and a communication link.
Servers are high-end computers that hold data and application programs shared by all network users.
Clients are the users' personal computers which provide a network access point and can perform a portion of processing depending on the system architecture. LAN system architecture can be characterized as two or three tier. System architecture refers to the structure used to organize computing responsibilities. With two-tier system architecture, the server integrates databases with a component part of the application logic while clients integrate user interface programs with the reminding portion of application logic. Application logic refers to programs used to process and analyze data.