IntelliSense is a feature commonly found in programming environments that helps developers write code more efficiently. It provides suggestions for code completion, function parameters, and variable names as you type, reducing the chances of errors and speeding up the coding process. This feature is especially useful for beginners who may not remember all the syntax or functions available in a programming language. Additionally, IntelliSense can offer quick access to documentation and tooltips, allowing developers to understand how to use different functions without leaving their coding environment. This enhances productivity and helps maintain focus while working on projects.