Is it right that when you do NAMASKAR gesture (both hands together in the praying position) you say NAMASTE (I salute to the sun that is in me and in you)? I ask you this because sometimes people do not know what really Namaste and Namaskar mean. Do these two have different meanings or the difference is only in the pronunciation?

The word ‘Namaste’, in Sanskrit, contains two words: ‘Namah’ and ‘te’. ‘te’ – means ‘to you’. ‘Namah’ – means ‘salutations’. It usually implies, I bow down to the God within you. The same is done when one addresses God directly. Primarily, it is done to erase our ego. Invariably, our psychology is that others should recognize me as great & they should respect me. That is, we have the superiority complex. By doing namaskar, we shall be effacing our ego and become humble, which is a primary condition for Spiritual Progress.
The act if greeting by joining palms together is called namaskar.