Explain Custom Settings With the Help of Vf Page and Apex Class in Salesforce?

Custom settings are like custom objects and in Salesforce there are two types of custom settings available :

1. List Custom Settings
2. Hierarchical Custom Settings

Please follow this article for more details.

Link : https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_customsettings.htm