The term "Classical guitar music" can refer to any kind of art music played on a nylon string guitar, or more narrowly to music of the classical period, as opposed to baroque or romantic music. The major feature of classical fingerstyle technique is that it enables solo rendition of harmony and polyphonic music in much the same manner as the piano can. The technique is intended to maximise the degree of control over the musical dynamics, texture, volume and timbral characteristics of the guitar. Careful attention is paid to the physical posture of the player. Thumb, index, middle and ring fingers are all employed for plucking. Chords are often plucked, with strums being reserved for emphasis. The repertoire varies in terms of keys, modes, rhythms and cultural influences. Altered tunings are rarely employed, with the exception of Dropped D.

https://en.wikipedia.org/wiki/Fingerstyle_guitar



From Wikipedia,
Fingerstyle guitar is the technique of playing the guitar by plucking the strings directly with the fingertips, fingernails, or picks attached to fingers, as opposed to flatpicking (picking individual notes with a single plectrum called a flatpick).
The term "fingerstyle" is something of a misnomer, since it is present in several different genres and styles of music—but mostly, because it involves a completely different technique, not just a "style" of playing, especially for the guitarist's right hand. The term is often used synonymously with fingerpicking, although fingerpicking can also refer to a specific tradition of folk, blues and country guitar playing in the US. See below.
Music arranged for fingerstyle playing can include chords, arpeggios and other elements such as artificial harmonics, hammering on and pulling off with the fretting hand, using the body of the guitar percussively, and many other techniques. Many times, the guitarist will play a chord and melody simultaneously, giving an advanced feeling of depth to the song. Fingerpicking is a standard technique on the classical or nylon string guitar, but is considered more of a specialized technique on steel string guitars and even less usual on electric guitars.

 https://en.wikipedia.org/wiki/Fingerstyle_guitar