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1. The waveform remains stationary.
2. Nodes and antinodes are formed alternately.
3. The points where displacement is zero are called nodes and the points where the displacement is maximum are called antinodes.
4. Pressure changes are maximum at nodes and minimum at antinodes.
5. All the particles except those at the nodes, execute simple harmonic motions of same period. 
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1) Two waves having the same amplitudes approach eachother from opposite directions.
2) The two waves are 180o out of phase with eachother and therefore cancel out(black horizontal line).

3) The phase difference between the two waves narrows. The resultant grows but is not in phase with either of the two waves.

4) The phase difference between the two waves is narrower still. The resultant is larger but is still out of phase with the two waves.

5) The phase difference between the two waves is now zero. The resultant has its maximum value and is in phase with the two waves.