to exchange · exchange · communication · interaction · to have social contact (with sb)

If you want to learn Chinese well, you should communicate with Chinese people more often.

People should get more involved.

Gestures are very important in human communication.

My mother speaks French better than my father speaks English, so they usually speak to each other in French.

And even outside these nations, English is perhaps more widely used as a medium of international communication than any other language.