These are forms for various categories of people showing the tax liability.
ITR 1 (SAHAJ) - Individuals having Salary and Interest Income
ITR 2- Individuals & HUFs having income other than income from Business or Profession
ITR 2A- Individuals & HUFs having income other than income from business or profession and capital gains and holds no foreign assets.
ITR 3- Individuals/HUFs being firm’s partners and running business or profession under proprietorship
ITR 4- Individuals/HUFs income having income from proprietorship business or profession
ITR 4S (SUGAM) - Individuals/HUFs having Presumptive business income
ITR 5- Persons other than HUF, Individuals, Company and person filing ITR 7
ITR 6- Companies excluding companies claiming deduction u/s 11
ITR 7- Persons including companies required to provide return u/s 139(4A) or 139(4B) or 139(4C) or 139(4D) or 139(4E)