What are the different types of Salesforce Communities, and how do you decide which one to use?

Salesforce offers different communities such as Customer Community, Partner Community & Employee community. Check out this table to decide which community type you want to use.

 In the meantime, check out these links as they give you a general idea about Salesforce communities. 

https://help.salesforce.com/s/articleView?id=platform.users_license_types_communities.htm&type=5

https://www.salesforce.com/eu/products/community-cloud/features/