Dynamic type checking is a programming feature where the type of a variable is checked at runtime, rather than at compile time. This means that the programming language can determine the type of a variable while the program is running, allowing for more flexibility in how variables are used. Languages like Python and JavaScript utilize dynamic type checking, enabling developers to write code without explicitly declaring variable types. This approach can lead to easier and faster development, as it allows for more rapid prototyping and changes. However, it may also introduce runtime errors if a variable is used inappropriately, making it essential for developers to implement thorough testing to catch potential issues.