Ideally, the way to get casted in an acting role starts with an agent submitting you for a part. A casting agent then sees your headshot and resume and is impressed enough to call you in for an audition. The day of the audition arrives, you crush it and get along swimmingly with the Casting Agent, Director, and Producers. You then win the role, which you go on to play with great success.
Now this is obviously the obstacle-free, pie-in-the-sky scenario, but the mechanics are very much authentic. In reality, getting casted in a role requires dedicated work and great persistence in the face of high industry standards and wildly fierce competition.
And while having an agent is an enormous facilitator in the process, it’s not necessarily an essential component to landing an acting role.