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A Web application is a program that runs over the internet - basically web page(s) with a server-side application. An enterprise application can be a stand-alone application, or a server-side application, it can be programmed to perform a wider range of tasks.
Connection pooling is a concept, where a number of connections are kept ready and waiting for requests (it occupies that much memory, but its really faster than creating a fresh connection). Most programs use connection pooling by default, so you dont need to do anything.
If you are writing a program, you should initialize a fixed number connections when you start, and not destroy connection objects when you reach that number. This way your connections remain in RAM - "pooled" as it can be called.
Chaitanya
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