Definition:
a guitar is a noun that means a stringed musical instrument typically played with the hands and fingers or a pick. Guitars typically have six strings, however there are others that have 12, and even more strings. A guitar has a fretboard with frets or metal bars placed along the length of the strings at certain intervals. A guitarist uses his/her fingers to press down on strings at certain frets to play a note.
Examples:
1. The guitar is my favorite musical instrument.
2. She was inspired to start learning the guitar when she was a teenager.
3. He strummed the guitar as the sun set beneath the horizon.
Tips:
when referring to a specific type of guitar, it is important to note that the word 'guitar' may be modified. For example, 'acoustic guitar', 'electric guitar', 'classical guitar', 'bass guitar', etc.