Logo design is one of the most difficult areas in graphic design. It's not just a cute image, it is the face of the company. A company's logo is the visual representation of a brand. For brand continuity, and because of the expense involved in changing it, a good logo should not be too trendy, but ideally last many years before needing a redesign.
A good logo:
is simple
looks good in black and white
looks good in small size
looks good appearing in a variety of situations (i.e. on products, in advertising, etc.)
usually includes the name of the company
communicates the image the company wants to project, as part of a marketing and brand management strategy
It is useful to use pantone colors - universal colors which used by professional print shops. Ready logo design is usually provided in vector graphics format. You can see logos on all types of business stationery, advertising, products, etc.
In general there are 5 types of logos:
Text plus Image (Iconic Logo / Combination logo)
Only Text (Wordmark Logo)
Abbreviation plus Image (Iconic Logo / Combination logo)
Only Abbreviation (Lettermark Logo)
Only Image (Graphic Logo / Symbol Logo / Brandmark Symbol)
Logo Design