IP-API is an online service that provides IP geolocation data. By using IP-API, users can obtain detailed information about IP addresses, including geographical location (such as city, region, and country), internet service provider (ISP), and timezone, among other details. The service is commonly used for security, analytics, and digital advertising purposes. IP-API offers a free tier with limited requests and a paid plan for higher usage, offering a straightforward querying process via a RESTful API.