The term IntelliSense refers to the editor functionality that offers suggestions to you as you type code. The major IntelliSense features that you are probably most familiar with are statement completion, parameter info, and complete word.
Statement Completion, Parameter Info, and Complete Word
Statement completion is the UI that displays what objects you can insert into your code that will be valid for that given location. It is also referred to as list members.
Complete word is very similar to statement completion, but without the UI. If the method or object you are typing is unique, complete word will fill out the word for you, even if statement completion is not showing. Complete word is the equivalent of clicking or hitting Enter ...