creating custom object in salesforce classic

Tab : to provide GUI(Graphical user interface) by which user/customer/partnere can manage the records inside the object.

-->   An object can have only one tab(one to one association)

upon creating the custom object if the user didnot select the check box "Launch new custom tab wizard after saving the custom object", the salesforce wonot create any Tab for that object.We need to create tab by manually.

Salesforce having 4 types of objects

1) custom objects : feature is used to create tab to used to manage the records exists inside the object
2) Web Tabs : these are used to re-direct the user to specified URL/Path of external application
3) visualforce Tabs : can re-direct user to the specified visualforce page  upon click on Tab.
4) Lightning Tabs : can re-direct user to specified Lightnng page.

Navigation: 

Setup menu
1)click on build menu in left panel
2) click on create option and expand it.
3) click on tabs
4) goto custom objects tab
5) click on new button
6)select the required object name from the picklist to create the tab
7) select tab style
8) click on next
9) make tab to get visible for all the profile users
10) next ---> save