Salesforce Sites, formerly known as Force.com Sites, is a feature within the Salesforce platform that allows organizations to build and deploy public-facing websites or web applications directly from their Salesforce environment. It enables companies to extend the power of their Salesforce data and functionality to external users, such as customers, partners, or the general public.

Key features of Salesforce Sites include:

1. Customization: With Salesforce Sites, you can create custom pages and applications using the same declarative tools available in Salesforce, like Visualforce and Lightning components.

2. Integration: You can integrate Salesforce data and processes into your sites, allowing external users to interact with your organization’s data, submit forms, view records, and more.

3. Security: Salesforce Sites come with built-in security measures, and you can control access to your sites through Salesforce’s user management and permission settings.

4. Branding: You can design your sites to match your organization’s branding using custom styles and layouts.

5. Mobile-Responsive: Sites created with Salesforce are designed to be mobile-responsive, providing a seamless experience for users accessing your site from various devices.

6. Public Access: Salesforce Sites allow external users to access specific pages or information without requiring them to log in to Salesforce, making it ideal for public-facing content.

7. Web Forms: You can create forms within your sites to capture user input and integrate that data directly into Salesforce records.

Salesforce Sites are commonly used for various purposes, such as customer portals, partner portals, event registration pages, knowledge bases, and more. The platform provides a flexible and scalable solution for organizations looking to engage with their external audience while leveraging their existing Salesforce data and processes.

Please note that specific features and capabilities of Salesforce products may evolve over time, so it’s essential to refer to the official Salesforce documentation or contact their support for the most up-to-date information.