Custom
objects are database tables that allow you to store data specific to
your organization in salesforce.com. You can use custom objects to
extend salesforce.com functionality or to build new application
functionality.
Once
you have created a custom object, you can create a custom tab, custom
related lists, reports, and dashboards for users to interact with the
custom object data. You can also access custom object data through the
Force.com API.
Navigation to create object in sales force: Setup->Build->Create->Object-> Click on new object and create object according to your requirement.
