Social media design is the practice of creating visuals for social media platforms such as Instagram, Facebook, TikTok, Twitter, and more.
Logo is a symbol made up of text and images that identifies a business.
Thumbnail is a small image representation of a larger image, usually intended to make it easier and faster to look at or manage a group of larger images.
Cover is presented as an illustration or photograph on the outside of a published product such as a book, magazine, newspaper.