The Acoustic guitar is a popular musical instrument that makes sound by the playing of its (typically) six strings with the sound being projected acoustically. The tone of an acoustic guitar is produced by the vibration of the strings, which is amplified by the body of the guitar, which acts as a resonating chamber. It is typically played by strumming or plucking the strings with the right hand while fretting the strings with the left hand. The guitar is a type of chordophone, traditionally constructed from wood and strung with either nylon or steel strings and distinguished from other chordophones by its construction and tuning. The modern guitar was preceded by the lute, the vihuela, the four-course Renaissance guitar, and the five-course baroque guitar, all of which contributed to the development of the modern six-string instrument.

There are 5 main types of modern acoustic guitars:

the classical guitar (nylon-string guitar)
The classical guitar is often played as a solo instrument using comprehensive fingerpicking technique’s for traditional & modern Classical music. It has gained great popularity in the Folk music world as well!!

the steel-string acoustic guitar
The steel-string acoustic guitar is a modern form of guitar that descends from the classical guitar, but is strung with steel strings for a brighter, louder sound. It is often referred to simply as an acoustic guitar, though the nylon-strung classical guitar is also sometimes called an acoustic guitar.
The most common type is often called a flat-top guitar, to distinguish it from the more specialized archtop guitar and other variations.
The Flat-top acoustic is the most popular played guitar & can be strummed or fingerpicked……

the archtop guitar
An archtop guitar is a steel-stringed acoustic or semi-acoustic guitar with a full body and a distinctive arched top, whose sound is particularly popular with jazz players.
An arched top and back, not flat, moveable adjustable bridge with F-holes similar to members of the violin family…..

the resonator guitar
A resonator guitar or resophonic guitar is an acoustic guitar whose sound is produced by one or more spun metal cones (resonators) instead of the wooden sound board (guitar top/face). Resonator guitars were originally designed to be louder than regular acoustic guitars, which were overwhelmed by horns and percussion instruments in dance orchestras. They became prized for their distinctive sound, however, and found life with several musical styles (most notably bluegrass and the blues) well after electric amplification solved the issue of inadequate guitar sound levels.
Resonator guitars are of two styles:
Square-necked guitars played in lap steel guitar style
Round-necked guitars played conventional guitar style or steel guitar style

the 12 string guitar
The twelve-string guitar is a steel-string acoustic guitar with twelve strings in six courses, which produces a richer, more ringing tone than a standard six-string guitar. Essentially, it is a type of guitar with a natural chorus effect due to the subtle differences in the frequencies produced by each of the two strings on each course. The strings are generally arranged such that the first string of each pair to be struck on a downward strum is the higher octave string..
Twelve-string guitars are made in both acoustic and electric forms. However, it is the acoustic type that is most common. Some progressive rock (Alex Lifeson), hard rock (Jimmy Page) and heavy metal (Dave Mustaine) musicians use double-necked guitars, which have both six-string and twelve-string components, allowing the guitarist easy transition between different sounds.