Search engine marketing is the practice of marketing a business using paid advertisements that appear on search engine results pages (or SERPs). Advertisers bid on keywords that users of services such as Google and Bing might enter when looking for certain products or services, which gives the advertiser the opportunity for their ads to appear alongside results for those search queries.

These ads, often known by the term pay-per-click ads, come in a variety of formats. Some are small, text-based ads, whereas others, such as product listing ads (PLAs, also known as Shopping ads) are more visual, product-based advertisements that allow consumers to see important information at-a-glance, such as price and reviews.

Search engine marketing's greatest strength is that it offers advertisers the opportunity to put their ads in front of motivated customers who are ready to buy at the precise moment they're ready to make a purchase. No other advertising medium can do this, which is why search engine marketing is so effective and such an amazingly powerful way to grow your business.