Trademark Message. A logo can be helpful. It may support later recollection and up to transport messages and trigger association. The Gospel of John starts with "In the beginning was the Word." A translation of the Greek "en arche ein ho logos," where "logos" actually stands for more. It has a range of meanings from the thought "idea" to the spoken "word" up to the underlying "logic." Private family crests and commercial signboards had been early forms of identifiers. Logotypes on the other hand came up to speed up the setting process with printing, by casting frequently used letter combinations into one type (ligature). Over the years, logos developed as combinations of letters and graphics. In modern times they are found almost everywhere, be it on product labels or letter heads, advertisements or websites.
Eye Catcher. Good logos catch the eye. They should not be too complicated to be easier remembered and reproduced, capable for "enlightening" as neon signs, while remaining distinctive. Under the aspect of marketing and branding, logos of sub-brands may carry variations and quotations of the mega brand inside, just as it is possible to play with logos by adding seasonal influences, such as snow on it's letters, as long as not overlaying the unmistakable appearance. Especially the top of letters has to remain intact, for during reading we mostly recognize the ascenders. The topography of typography has to remain clear. Hearing a speech about logos, I would try to consider this aspect, when thinking up the first logo for this website (and its variations found at the end of this page).
Identification Point. Sometimes we say "logo" as a short form of logical, a standard answer when everything is clear. Using some imagination, a logo should sum up values it stands for (besides dynamic, positive and future oriented as most common requirements to its design) and be something to identify with. This is why a logo can be helpful as one of the first things to brainstorm on when setting up and scoping a big project. As an example, nearby you will find my take on a certain sticker, found on most PCs. Back then, the Euro currency was introduced in quite a few European markets at the same time, for accounting purposes with the beginning of the fiscal year. A logo can be a typeset, a color, a sign, an angle meant to describe goals. To reflect on those isn't a bad idea anyway. What could your logo look like?