CSV is a 'Comma Separated Values' Text File.
It will have contents of various columns as comma separated Values. For instance,
KeyColumn,Name,Value
35,"Andaman & Nicobar",35
12,"Arunachal Pradesh",12
18,Assam,18
10,Bihar,10
4,Chandigarh,4
22,Chhattisgarh,22
6,Haryana,6
2,"Himachal Pradesh",2
1,"Jammu & Kashmir",1
20,Jharkhand,20
29,Karnataka,29
32,Kerala,32
23,"Madhya Pradesh",23
27,Maharashtra,27
14,Manipur,14
17,Meghalaya,17
15,Mizoram,15
13,Nagaland,13
21,Odisha,21
33,"Tamil Nadu",33
16,Tripura,16
3,Punjab,3
8,Rajasthan,8
36,Telangana,36
26,"Dadra & Nagar Haveli",26
7,Delhi,7
30,Goa,30
31,Lakshadweep,31
11,Sikkim,11
9,"Uttar Pradesh",9
5,Uttarakhand,5
19,"West Bengal",19
34,Puducherry,34
25,"Daman & Diu",25
37,"Andhra Pradesh",37
24,Gujarat,24