Objects in Salesforce are used as database tables that are used to store information of an organization. We have 2 types of objects in salesforce, they are.
Standard Object: These are the objects provided by the salesforce which include contacts, accounts, opportunities, leads, cases, campaigns, products, contracts, dashboards, etc.
Custom Object: This includes the modifications made to the Salesforce by users. It stores the essential and unique information of an organization. Custom Object includes page layouts, relationship to other objects, custom user interface tab, custom fields, etc.