'Net' is a term referring only to serves in tennis. If your ball hits the net on a serve and still lands within the correct service box, your opponent calls 'net', which means you are allowed to take your serve over. This applies to both first or second serves. If you continuously get 'net's, you would basically be serving for forever.
However, if your serve hits the net and bounces anywhere outside of the correct service box, it is considered out.
Once again, 'net' is only called during serves. During the actual rally, the net plays no real role. If it hits the net and goes in, it's in. If it hits the net and goes out, it's out.
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Net is when a player serves the ball at the begging of a point and the ball hits the top of the net cord and bounces "in" the opponents service box. The point doesn't count and is then replayed. Although if the ball doesn't bounce "in" then the point is awarded to the opposing player and isn't played again.