A motivational speaker is a professional who is enthusiastic about motivating others via speech. These days, most speakers do it through a variety of activities, including performing experimental activities on stages and leading training sessions for corporate teams to encourage them. With the advancements in technology that we currently have, motivational speakers are doing an excellent job at motivating people.
External motivation is achieved by motivational speakers motivating others externally via their words and personal experiences of adversity. Now it's up to you to figure out how to stay motivated while listening to all of their words. Internal motivation is when you drive yourself towards a goal while hearing their motivational words, which hit you and give you the motivation to continue on your trip.
To your speaking success!