1. Main Worker: A main worker is an individual who is engaged in economically productive activities for a major part of the reference period. This category typically includes those individuals who are actively employed for most of the year.

2. Cultivator: A cultivator is someone involved in agricultural activities, particularly in the cultivation of crops. Cultivators may own or lease agricultural land and are directly engaged in the cultivation of crops.

3. Labourer: A laborer is a person engaged in physical work or manual labor, often as part of a broader workforce. Laborers may work in various industries, including construction, manufacturing, and services, and their work involves tasks that require physical effort.

4. Marginal worker: The category of "marginal worker" includes individuals who are employed for less than six months in a year. This classification is often used in labor and employment studies to distinguish individuals with irregular or seasonal employment patterns.