What are the different types of Sharing Rules in Salesforce and explain them?

the different types of Sharing Rules in Salesforce:

Account sharing Rule.
Contact Sharing Rule.
Case Sharing Rule.
Opportunity sharing Rule.
Lead Sharing Rule.
Custom Object sharing Rule.

Sharing Rules in Salesforce make automatic exceptions to your organization wide sharing settings for defined set of users. Using Sharing Rules in Salesforce we can extend sharing access to user in public groups, roles or territories. Sharing rules can never be stricter than Organization wide default settings.