A construction worker is someone who is employed as part of a construction crew and will perform many tasks that often involve physical labour on construction sites. However, there are plenty of roles that don't involve being on a construction site.

Construction companies are in the business of conducting engineering works, i.e., erecting buildings and other built physical infrastructure like roads and bridges. These companies' offerings differ based on expertise; some focus on industrial infrastructure, residentials, and water structures, among others.