Tabs:
Tab is a User interface to create records for
object and to view the records in objects.
In salesforce we four types
of tabs
1. Custom object Tab
2. Web Tab
3. Visualforce Tab
4.  Lightning Page Tabs
Path to create Custom tabs.
Setup -> Build -> Create -> Tab -> click on New tab and enter the details
to complete the tab creation process.
 
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Feature of Custom
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 They look and behave like standard salesforce.com tabs such
    as accounts, contacts, and opportunities. 
Custom object tabs include the following features: 
A home page listing key recordsCustomizable list viewsDetail and edit pages for maintaining custom
         dataA link on the task bar for creating new records 
If you want to
    create a custom object tab, select an existing custom object or create a
    new one. The tab label, fields, and page layout are all part of the custom
    object definition. 
 
 
User can also create their own tab style 
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