Successful communication is an exchange, two people sharing insights on the same topic. Their insights might be diametrically opposed, but each expresses an opinion and listens to the response.
Many times the conversation instead of being a dialogue becomes a monologue. Only one person does all the talking and the other listens. This leads to breakdown in conversations. Good conversation like good tennis needs volleying from both sides.
So remember when you converse allow the other person to air his / her opinion. Try to understand his view if possible even if it is totally against your opinion.
Whether speaking to an audience of hundreds or of one, strengthen your speaking- and your image with a short silent pause. We often clutter our speech with verbal crutches-"like", "Uhh" "Err" "Well" . We lean on these crutches to fill the silence when thinking of the next idea or word. The silence is better.
If you use these crutches break the habit by pausing. Make no sound. You will be surprised to see how quickly the next word pops up. And you will find the silence is hardly noticeable.