ESI (Employee State Insurance) registration is a mandatory process in India for certain employers and their employees. ESI is a self-financing social security and health insurance scheme for workers in India, which provides medical and cash benefits to employees and their dependents. Here are the key points related to ESI registration:

Applicability: ESI registration is applicable to factories and establishments with 10 or more employees. In some states, the threshold is 20 employees. It applies to both the employer and the employees.
Benefits: ESI provides benefits such as medical, sickness, maternity, disability, and dependent benefits to employees and their families.
Contribution: Both the employer and the employee make contributions to the ESI fund. The employer contributes a percentage of the employee’s wages, while the employee contributes a smaller portion.
Registration Process:
Employers need to register their establishment under ESI within 15 days from the date the ESI Act becomes applicable to them (i.e., when they meet the employee threshold).
Employers must fill out Form 01 and submit it to the appropriate ESI office along with the required documents.
Once the registration is approved, the employer will receive a 17-digit unique identification number known as the ‘ESI Code Number.’