The key words are the several search words selected by SEO expert/your e-marketer for your website to SEO and E-market (SEM, SMM or SMO) your website.

The search words are the words that are being typed by internet users in popular serach engines while trying to find a certain product (good or service) or information.

For example, if you sell computer mouses from your website, your SEO expert/e-marketer will be probably considering such search words as 'computer mouses', 'computer mouse', 'buy computer mouse' or 'buy computer mouse new york' as key words for your website.

The key words are only those few search words that will be targeted for your website to get high search engine placements for.

Usully it is a good idea to select just several key words, from 2 to 10 for a small or medium-sized business.

Targeting too many key words can be too expensive and will prolong the time you get your profits from a growth in your website popularity thanks to SEO and e-marketing (SEM, SMM, SMO).