All strings produce their tone by the vibration of stretched strings.
Examples of string instruments
violin, viola, cello, harp, double bass
The woodwinds produce tone by means of a vibrating column of air enclosed in a pipe or tube, and with the exception of the flute and piccolo, they produce the vibration by means of a single or double reed.
Examples of woodwinds instruments
Oboe, English horn, flute, Piccolo, Clarinet, Bass clarinet, Bassoon, Contra-bassoon
The brass section includes instruments in which the vibration is made by air blown through the player's lips which are pressed into a cup-shaped mouthpiece. You buzz your lips into a cup-shaped mouthpiece. Lowest.
Examples of brass instruments
French horn, trumpet, trombone, tuba
The percussion instruments provide the orchestra with accents, rhythms and special timbres. In most cases, a sound is produced by striking the instrument with another object; a stick, mallet or beater.