Wordmark logos: Wordmarks are the most widely used logo type, and are typically comprised of text and a typeface. The text or company name is usually written and given a unique typographic treatment (e.g. Microsoft, Yahoo, The Home Depot).
Brandmarks / Iconmarks: A strong yet simple graphic symbol, that represents the company. This can be realistic or more abstract (e.g. Nike swoosh, Apple Computer).
Combination marks: A combination of an iconic symbol along with a wordmark. This is a flexible means of conveying the company name and introducing an element to act as a symbol for the company. The elements can be used separately or together.

 
                                                                                                                                        