As per Section 2(1) of the said Act, A worker means a person wmployed, directly or by through any agency (including a contractor) with or without the knowledge of the principal employer. He may be employed for or without the remuneration. But he must be employed in a manufacturing process, or in a cleaning some part of the manufacturing process, orin some kind of work oncidental to, or connected with, the manufacturing process, or subject of the manufacturing process.
Whather a particular person is a worker depend on the terms of the contract between him and the employer. A worker does not include an independent contractor or coolies or servants who are not under the control and supervision of the employer.