Implicit casting, also known as automatic type conversion, occurs when a programming language automatically converts one data type to another without explicit instructions from the programmer. This typically happens when a value of a smaller data type, like an integer, is assigned to a larger data type, such as a float. The language handles the conversion to prevent data loss and ensure compatibility. For example, in languages like Java or C++, if you assign an integer value to a float variable, the integer is implicitly cast to a float. This process helps maintain code simplicity and readability, allowing developers to focus on logic rather than type management.