This video explains the function of the "Start Job" button within a job record in Kickserv. Its purpose is to enable technicians to indicate when they commence work on a job, thereby changing its status to "In Progress." Clicking this button registers the start time and location of the job, which is recorded in the job history section of the job record. The video demonstrates how clicking the "Start Job" button changes the job status and shows its effects both on the web platform and the Kickserv mobile app.