Using entity snaps  

Entity snaps enable you to quickly select exact geometric points on existing entities without having to know the exact coordinates of those points. With entity snaps, you can select the endpoint of a line or arc, the center point of a circle, the intersection of any two entities, or any other geometrically significant position. You can also use entity snaps to draw entities that are tangent or perpendicular to an existing entity.             

You can use entity snaps any time the program prompts you to specify a pointfor example, if you are drawing a line or other entity. You can work with entity snaps in one of two ways:

    Enable a running entity snap that remains in effect until you turn it off by choosing an entity snap when no other command is active.    

    Enable a one-time entity snap for a single selection by choosing an entity snap when another command is active. You can also use a one-time entity snap to override a running entity snap.    

If you type the name of entity snaps, you dont need to type the whole name.
Type only the first three letters of the snap name.    

When using entity snaps, the program recognizes only visible entities or visible portions of entities. You cannot snap to entities on layers that have been turned off or frozen.

When you specify one or more entity snaps, an entity snap target box is added to the crosshairs. In addition, an icon appears adjacent to the crosshairs indicating the active entity snap. When you select an entity, the program snaps to the snap point closest to the center of the target box.            

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Setting entity snaps

Nearest snap

Endpoint snap

Midpoint snap

Center snap

Geometric Center snap

Perpendicular snap

Tangent snap

Quadrant snap

Insertion Point snap

Node snap

Extension snap

Parallel snap

Apparent Intersection snap

From Point snap

Track Point snap

Mid Between 2 Points snap

Clearing entity snaps

Using fly-over snapping

Using entity snap tracking