Visual Basic is issued from BASIC, a programming language designed to be easy tu use: the Basic word mean "Beginners All-Purpose Symbolic Instruction Code". It's the most commonly used programming language, under differents variants. It is powerful enough to do nearly all the things you can do with any another language, like C++.
It's an object-oriented language, which enable you to create your owns software components: It is not more limited to a predefined set of instructions than was BASIC.
Visual Basic is written by Microsoft. On-line help, tutorials, and knowledge base are available on their web-site.