Hi Anand,
I suppose you want to know about Bachelor of Computer Application (BCA)
BCA is a three year under graduate degree which comprises of six semesters, in which an individual learns about computer languages.
In BCA you learn about database management systems, operating systems, software development, computer architecture and languauges like : C, C++, HTML, JAVA, etc
Eligibility : Most College's eligibility criteria is minimum 45% aggregate marks in 12th with Maths, but there are some colleges which do not consider maths to be compulsory.
You can grab jobs as Software Tester, Web Developer, Software Developer, System Administrator, Junior Programmer, etc
Hope it helps :)