Purpose of the “Build Automatically” option in eclipse

Question

What is the purpose of Build Automatically option in Eclipse (Project-->Build Automatically)? Mine will alwa

Answer 1

One more difference is:
Most of the time while working on JSPs it helps me when checking "Build Automatically". It automatically picks up the changes in JSPs.
But if you make changes in your java classes/XMLs you need a manual build. Since I'm using resin server which is run outside eclipse via command prompt, i prefer checking the option.
When i have my server setup in eclipse, i turn it off and use Publish on server.

This is the way i use and the answer is based on my experience.