Search engine marketing (SEM) means displaying ads on search engines results pages (SERPs) based on certain keywords. Businesses have to pay for these ads to the search engines and this is the reason why it is a paid service. Although hiring a San Francisco SEM agency is similar to that of hiring a digital marketing service or SEO service, there are still some points on which you have to count upon. There are some points you have to consider before hiring a SEM service company. ● Look at what se