A "switch case" is a programming construct used to execute different blocks of code based on the value of a variable. It allows developers to simplify complex conditional statements by providing a cleaner and more organized way to handle multiple possible values. Each case represents a specific value, and when the variable matches that value, the corresponding block of code runs. Switch cases are commonly used in languages like Java, C++, and JavaScript. They improve code readability and maintainability, making it easier to manage multiple conditions without excessive if-else statements. This structure is particularly useful when dealing with a limited set of known values.