- Application - series of tabs eg Sales, Marketing accessible from dropdown top right. This also has an item for App Launcher.
- Objects - standard or custom and are represented by a tab.
- Tab - item in top nav eg Campaigns, Leads, Contacts etc. If you cannot see the tab you want, click the + to see all tabs. Go to Tabs in setup to Rename Tabs and Labels or Create a new tab. There are four types of tabs: