A logo is a graphical element, (ideogram, symbol, emblem, icon, sign) that, together with its logotype (a uniquely set and arranged typeface) form a trademark or commercial brand. Typically, a logo's design is for immediate recognition, inspiring trust, admiration, loyalty and an implied superiority. The logo is one aspect of a company's commercial brand, or economic entity, and its shapes, colors, fonts, and images usually are different from others in a similar market. Logos are also used to identify organizations and other non-commercial entities.

Today there are many corporations, products, services, agencies and other entities using an ideogram (sign, icon) or an emblem (symbol) or a combination of sign and emblem as a logo. Resultingly, only a few of the thousands of ideograms people see are recognized without a name. It is sensible to use an ideogram as a logo, even with the name, if people will not duly identify it. Currently, the usage of both images (ideograms) and the company name (logotype) to emphasize the name instead of the supporting graphic portion, making it unique by its letters, color, and additional graphic elements.

Ideograms (icons, signs, emblems) may be more effective than a written name (logotype), especially for logos being translated into many alphabets; for instance, a name in the Arabic language would be of little help in most European markets. An ideogram would keep the general proprietary nature of the product in both markets. In non-profit areas, the Red Cross (which goes by Red Crescent in Muslim countries) is an example of an extremely well known emblem which does not need an accompanying name. Branding aims to facilitate cross-language marketing. The Coca-cola logo can be identified in any language because of the standards of color and the iconic ribbon wave.