A fat client or rich client is a computer (client) in client-server architecture networks which typically provides rich functionality independently of the central server. Originally just a "client", or "thick-client" in the early days of PC based computing, the word "fat" is in opposition to the "thin" within thin-client, however it typically means that the size of the application which resides on the client machine is large (although browsers such as Internet Explorer, within thin-clients, are often far bigger).
A fat client still requires at least periodic connection to a network or central server, but is often characterised by the ability to perform many functions without that connection (consider a fat mail client such as Microsoft Outlook compared to a thin-client-based mail system such as Hotmail). It is also usually characterised by a requirement to install a specific application.
In designing a client-server application, there is a decision to be made as to which parts of the task should be done on the client, and which on the server. This decision can crucially affect the cost of clients and servers, the robustness and security of the application as a whole, and the flexibility of the design to later modification or porting.
The characteristics of the user interface often force the decision on a designer.
For instance, a drawing package could choose to download an initial image from a server and allow all edits to be made locally, returning the revised drawing to the server upon completion. This would require a thick-client and might be characterised by a long time to start and stop (while a whole complex drawing was transferred) but quick to edit.
Conversely, a thin client could download just the visible part(s) of the drawing at the beginning and send each change back to the server to update the drawing. This might be characterised by a short start-up time, but a tediously slow editing process.
Answered by
Hem@nt
, an ibibo Master,
at
10:45 AM on May 05, 2008