Skilled labor refers to highly trained, educated, or experienced segments of the workforce that can complete more complex mental or physical tasks on the job. Skilled labor is often specialized and may require a prolonged period of training and experience.

Semi-skilled labour refers to a job category that requires candidates to have some experience, training and knowledge about a role before they begin work. Typically, the requirements for these roles are less severe than they are for specialised positions or those that require advanced education.

Skill is a measure of the amount of worker's expertise, specialization, wages, and supervisory capacity. Skilled workers are generally more trained, higher paid, and have more responsibilities than unskilled workers.