Weakly typed languages are programming languages that do not enforce strict rules on how data types are used. This means that variables can change types during execution, allowing for more flexibility. For example, a variable can hold a number at one point and a string at another without causing an error. This can make coding faster and easier, especially for beginners. However, the flexibility of weakly typed languages can lead to unexpected behavior and bugs. Since the language does not strictly check types, operations that mix different data types may produce unpredictable results. Examples of weakly typed languages include JavaScript and PHP.