Type safety is a programming concept that ensures variables are used consistently according to their defined data types. This means that if a variable is declared as an integer, it cannot be mistakenly used as a string or any other type. Type safety helps prevent errors and bugs in code, making programs more reliable and easier to maintain. Languages that enforce type safety, such as Java and C#, check types at compile time or runtime. This reduces the risk of type-related errors, allowing developers to catch issues early in the development process. In contrast, languages like JavaScript are more flexible but can lead to unexpected behavior due to less strict type enforcement.