There are a variety of terms used to describe linking in Microsoft Project:
Linking
Setting dependencies
Sequencing deliverables
Network diagramming
Setting predecessor and successor relationships, etc.
There are four different types of links that can be created between tasks:
Finish to Start
Start to Start
Finish to Finish
Start to Finish
There are three basic ways to link tasks:
Selecting tasks and then clicking the Link command
Editing any of the many predecessor or successor fields
In the taskbar pane of a Gantt Chart view, Network Diagram view, or a calendar view, click, hold and drag the link command