Solidity is a high-level, contract-oriented programming language used to develop smart contracts on the Ethereum blockchain platform. It was specifically designed for writing smart contracts and is similar in syntax to other popular programming languages such as JavaScript and C++.

Solidity allows developers to write self-executing contracts that are stored on the Ethereum blockchain and can be triggered automatically when certain conditions are met. These contracts can be used to manage assets, transfer funds, and enforce agreements between multiple parties without the need for intermediaries.

Some key features of Solidity include:

1. Types: Solidity supports various data types such as integers, strings, booleans, and arrays.
2. Inheritance: Solidity supports inheritance, allowing developers to build complex contracts by reusing code from other contracts.
3. Functions: Solidity provides support for functions, which can be used to perform operations and interact with other contracts.
4. Libraries: Solidity supports libraries, which are reusable code blocks that can be linked to other contracts.
5. Events: Solidity supports events, which allow contracts to broadcast messages to other contracts and to the Ethereum network.
6. Modifiers: Solidity provides support for modifiers, which allow developers to specify conditions that must be met before a function can be executed.
7. Gas: Solidity provides support for gas, a unit of computational effort required to execute smart contract code.

Solidity is an important tool for developing decentralized applications (dapps) on the Ethereum platform, and is used by developers around the world to create a wide range of decentralized applications, from financial services to gaming and beyond.