Ethos is about establishing your authority to speak on the subject, logos is your logical argument for your point and pathos is your attempt to sway an audience emotionally.
Those are mainly used for “argument” essays and stuff but they are also used a lot in advertisements. Examples of each are
Ethos: “Michelle Obama uses this product” or “9/10 dentist recommend this toothpaste”
Logos: “This acne cream helps 3/4 of the people who use it”
Pathos: “For just 59¢ a day you can save these starving animals” or “What would you do if this was your child”