Salesforce AppExchange is an online marketplace where third-party developers can create and distribute applications that integrate with the Salesforce platform. These applications can be used to extend the functionality of Salesforce, providing additional features and capabilities that are not available out-of-the-box.

Salesforce AppExchange includes a wide variety of applications, including business productivity tools, marketing automation solutions, customer service applications, and many others. Some of these applications are free, while others require a fee or subscription to use.

AppExchange provides a convenient and centralized location for Salesforce users to discover and install new applications, making it easier to customize and enhance their Salesforce experience. It also provides developers with a platform to showcase and distribute their applications to a large and diverse audience.