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Running snaps are snaps that are constantly active, as opposed to one-time snaps invoked by SEKEs and the local menu. You can turn on running snaps by:
Selecting items from the Snaps menu.
Clicking the icon or combination of icons on the Snap Modes toolbar.
 
Using the *Draw AnchorXids95606Xids95606O button Right-click on the DRAW button next to the Coordinate Fields, and check checking the desired snaps.

Use hotkeys. You can view these in the Snaps menu. For example, Shift+V turns on Vertex snap.

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Note: Be careful with the snap modes you leave running. For example, if only Vertex is in use, you will not be able to select any point besides a vertex.

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