Pressing a key on the piano's keyboard causes a padded (often with felt) hammer to strike steelstrings. The hammers rebound, and the strings continue to vibrate at their resonant frequency. These vibrations are transmitted through a bridge to a sounding board that more efficiently couples the acoustic energy to the air. The sound would otherwise be no louder than that directly produced by the strings. When the key is released, a damper stops the string's vibration and the sound. In the Hornbostel-Sachs system of instrument classification, pianos are considered chordophones.
The word piano is a shortened form of pianoforte (PF), the Italian word for the instrument (which in turn derives from the previous terms gravicembalo col piano e forte and fortepiano). The Italian musical terms piano and forte indicate "soft" and "strong" respectively, in this context referring to the variations in sound volume the instrument produces in response to a pianist's touch on the keys: the greater the velocity of a key press, the greater the force of the hammer hitting the strings, and the louder the sound of the note produced.
Bechstein is a German manufacturer of pianos, established in 1853 by Carl Bechstein who set out to manufacture a piano able to withstand the great demands imposed on the instrument by the virtuosi of the time such as Franz Liszt. In 1857, Hans von Bülow (Liszt's son-in-law) gave the first public performance on a Bechstein grand piano. Today, Bechstein is in competition with Steinway & Sons, although the Bechstein sound is very different from Steinway's.
I think one of the best things you can do, no matter what you play, is to take up piano. Music is based on chord changes and harmonies, and you can get 'em more out of an instrument like piano, where you can hear all the notes at once.