Details of your Salary structure are mentioned in your Form 16 Part B.
Usually, the salary of an individual is made up of various components like allowances, bonus, perquisites, etc. Form 16 Part B is a detailed breakdown of all components included in your salary.
The employers have to issue Form 16 for FY 2020-21 in a standardized format by 15th August 2021.
In case you do not have Form 16, you can also calculate these salary details using your Salary Slips.