The dictionary meaning of a logo is a symbol, sign, or emblem. Human beings have used such symbols throughout time to convey a succinct message. In present times, logos tend to be graphical in nature, designed for easy recognition of an organization. It is a tool to build an identity for the organization, as part of its trademark or brand, and to generate favourable thoughts and feelings about the organization.
A logo needs to be original and memorable for the greatest impact.