What is the use of eclipse

Answer 1

to block out the sun

Answer 2

Eclipse is a platform that has been designed from the ground up for building integrated web and application development tooling.

Basically, it's a place where you type your code -Like Notepad- but with upgrades. Unlike notepad, with eclipse you can compile run and test your code with one click, import and create projects easily, and, most importent, It highlights/marks some errors you made during programing and with a right click on the error, offers you explantions or ways to fix it.