How SEM works
Advertisers bid on keywords. When someone searches for one, an auction decides which ads appear and in what order, based on bids and ad quality. Advertisers usually pay only when someone clicks, which is why SEM is often called pay-per-click or PPC.
SEM vs SEO
Both aim to win visibility in search results. SEM buys placement in the ad slots and stops when spending stops. SEO earns placement in the unpaid results and keeps working over time but takes longer to build.
When SEM makes sense
When you need leads quickly, want to test which searches convert before investing in SEO, or compete for searches where unpaid results are crowded. Many businesses run both, using SEM for speed and SEO for long-term growth.
Why SEM matters
SEM puts your business in front of people at the moment they search for what you sell. Because you control keywords, budgets and messages, it's one of the fastest ways to turn search demand into calls and sales.
Testing before investing
A software company wasn't sure which of three product angles buyers cared about most. It ran search ads for each for a month, found one converted far better and then built its SEO content around that angle.
Common mistakes
Bidding on broad, vague keywords
Broad terms bring clicks from people who aren't looking to buy. Focus on searches with clear intent.
Sending ads to the homepage
Ads work best when they land on a page that matches the search. A generic homepage loses many visitors.
Not tracking conversions
Without conversion tracking, you can't tell which keywords bring customers, only which bring clicks.
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