What are the different types of data that can be stored in a Solidity contract?

Solidity provides a number of built-in data types that can be used to store data in a contract. Here is a list of the most commonly used data types:

• bool: a boolean value (true or false)
• int, uint: signed and unsigned integers of various sizes (e.g. int8, uint256)
• bytes: a dynamic array of bytes
• string: a dynamic array of characters (strings are UTF-8 encoded)
• address: an Ethereum address
• enum: a custom enumeration type

In addition to these basic data types, Solidity also supports more complex data structures such as arrays, mappings, and structs.