What is the Customer Portal and Partner Portal in Salesforce?

Salesforce is a well-known name in the world of CRMs, portals, and communities.
What is Salesforce Partner Portal?
Salesforce partner portal allows partner users outside of your organization to login to Salesforce. It helps companies by empowering their indirect sales channel and this increases their ROI. Users of the partner portal have limited access to Salesforce and can only see the data of the modules for which they are granted access. With the help of partner relationship management (PRM), companies can create multiple portals to manage, track, and handle their indirect sales.
What is Salesforce Customer Portal?
Salesforce customer portal is an interface that is useful to provide support to your customers, help them solve issues about your products/services thereby better overall user experience. As a company, you can create a personalized customer service portal including features, sections, information, modules based on your requirements to streamline communication with your customers.