Google alone sees over 100 billion searches each month. Why? Because when people want or need something, it is becoming an instinct to turn to search engines. People search when they want to know something, when they want to go somewhere, when they want to do something, and more. every search represents an opportunity for marketers looking to influence the decisions of the consumer. This type of advertising uses a pay-per-click format in which advertisers pay for each user that clicks on their ad. You can also bid on keywords that relate to what you are offering to get a better ad position.
If you want to be successful with you ads, you need to conduct some type of research so you know who your target market is and what they are searching. Knowing what the consumer wants and how they go about searching for it is huge in terms of getting your brand out there. Some of my older posts go into more detail about this, but this is an overview to get ready to take the Search Advertising exam for Google Adwords.