In most cases, Form 16 is given to all salaried workers by their employers. However, in some cases, you might not get Form 16.
In such instances, you can still complete your ITR using payslips to determine salary, exemptions, and deductions.
One should get all of their pay stubs for the whole year, download their 26AS statement, and check to see if their salary and TDS match up with their form 26 AS.