What is a logo? A logo identifies a business in its simplest form via the use of a mark or icon. It's a symbol that, when used consistently and correctly, people will recognize and immediately associate with the product/service that it represents.
But a logo is only the symbol and should be used consistently with the tagline as part of a complete brand. Branding goes way beyond just a logo or graphic element. Your brand should represent the entire customer experience … everything from your logo, your website, your social media experiences, the way you answer the phone, to the way your customers experience your staff.