A strongly typed language is a programming language that enforces strict rules about how data types are used. In these languages, each variable has a specific type, such as integer, string, or boolean, and operations on these variables must be compatible with their types. This helps prevent errors, as the compiler or interpreter will catch type mismatches before the program runs. Examples of strongly typed languages include Java, C#, and Python. In contrast to weakly typed languages, where types can be more flexible, strongly typed languages promote clearer code and reduce the likelihood of unexpected behavior during execution.