A basis for the organisation and classification of ragas depending on the notes used
Thaat:
Kafi
Preferred time or season for playing
Time:
Midnight
The most prominent note of a raga
Vadi
/
The second most prominent note of a raga
Samvadi:
, 
Categorization based on number of notes used in aroh and avaroh
Jati:
Containing 7 notes
Sampurna
-
Containing 7 notes
Sampurna
Emotions evoked by the raga
Mood:
Bhakti (Devotion), Chanchal (Lively), Karun (Sad, Compassionate), Shringar (Romantic)
Kafi is the representative raag of the Kafi thaat. It has all the seven notes both in
Ascending movement of notes
aroh
 and
Descending movement of notes
avaroh
. and are
A flat note
komal
 and the remaining notes are shudh. Mostly this raga is used for semi-classical presentations like Thumri, Tappa, Hori etc. A majority of the compositions will have descriptions of Holi festival and its celebrations. Sometimes to add more emotions
A natural note (corresponds to notes in Western major scale)
shuddha
 and are also used, in which case it is called Mishra Kafi.