Your brand is what other people say about you when you’re not in the room.
A logo is a graphic mark, emblem or symbol used to aid and promote public identification and recognition. It may be of an abstract or figurative design or include the text of the name it represents as in a wordmark.
A brand is a name, term, design, symbol or other feature that distinguishes an organization or product from its rivals in the eyes of the customer. Brands are used in business, marketing and advertising.
Corporate identity is a combination of the logo, color schemes, fonts, designs, collateral, marketing materials, words, etc., that a firm employs to make a visual statement about itself and to communicate its business philosophy. It is an enduring symbol of how a firm views itself, how it wishes to be viewed by others, and how others recognize and remember it.