What Is Search Engine Marketing?

Search engine marketing, or SEM, is marketing your business through search engines like Google and Bing. Most often the term means paid search: ads that appear at the top of the results, marked "Sponsored," that you pay for each time someone clicks. Some use it more broadly to cover both paid ads and SEO, the unpaid work of showing up in the regular results. Both definitions are common, so when an agency quotes you "SEM," ask which one they mean.

This guide explains how paid search actually works, what it costs and what drives that cost, how it differs from SEO, and how to decide where your budget goes.

How paid search works

You choose the searches you want to show up for, write ads, set a daily budget, and bid on what you're willing to pay for a click. When someone searches, Google runs an auction among the advertisers who want that search and decides which ads show and in what order.

Bids aren't everything. Google says its Ad Rank decides whether and where your ad shows, and it's built from several inputs: your bid, the quality of your ad and landing page, the competition for that search, the context of the search (location, device, time of day), and the expected effect of extras like sitelinks. Google also notes that what you actually pay per click is often less than your maximum bid.

Quality is where a small advertiser can compete with a bigger one. Google gives each keyword a Quality Score from 1 to 10, based on how likely people are to click your ad, how closely the ad matches the search, and how useful your landing page is to the people who land on it. A better landing page can mean a better position for the same money.

What it costs

There's no standard price. Cost per click depends on how many companies are bidding on the same search in the same area. A search like "commercial roofing contractor" in a big metro area can cost far more per click than a niche industrial term in a smaller market.

To see real numbers for your market, use Google's Keyword Planner, which gives suggested bid estimates for each keyword along with how often people search for it. It's free, though you'll need a Google Ads account with a campaign set up to use it.

Then budget for more than clicks. Someone has to build the campaigns, write the ads, add negative keywords (searches you don't want to pay for), check the search terms report every week, and adjust bids. Agencies usually charge a monthly management fee or a percentage of ad spend on top of the spend itself.

Paid search and SEO, side by side

One thing to be clear on: money spent on ads doesn't help your organic rankings. Google states that it doesn't accept payment to rank pages higher in its regular results. The two systems are separate.

Which one should you fund?

Paid search makes sense when you need calls soon, when you're launching a new service or entering a new area, or when the jobs are valuable enough that a few clicks per lead still pencils out. It's also useful for testing which searches bring in real work before you build pages around them.

SEO makes sense when you want inquiries that don't stop the day the budget does, and when your buyers research before they call. It's slower. Much slower. It's also how a business earns a place in the regular map listings and gets cited as a source in AI answers.

Plenty of companies run both: ads to cover the gap while organic visibility builds, then less ad spend as search starts to carry more of the load. Before deciding, it helps to know where you stand today. Our Free AI Visibility Check looks at your website, your mobile speed, whether you come up in a local search, and what an AI assistant says when a buyer asks who to call. No email needed.

Where Inbound SDR fits, and where it doesn't

To be plain about it: Inbound SDR doesn't run paid ads. We don't manage Google Ads or Microsoft Advertising campaigns. It covers the organic side of search engine marketing.

That means a website of up to 100 pages built in the first month around every service you sell and area you serve, which we then host and maintain; local SEO for your Google Business Profile and Bing Places listing, with your details kept consistent across 65 or more directories; technical SEO, including page speed and Core Web Vitals; and a new blog every business day, posted to up to 3 social platforms. You get a dedicated strategist. You get a monthly report. Packages start at $1,000 per month on a 12-month term.

If you only want ads, you need a paid search specialist, and we're not it. If you're running ads and want organic search to start carrying more of the work, a strong site helps there too, since Google's Quality Score includes landing page experience.

Short answers

Is SEM the same as PPC?

Often, yes. PPC (pay per click) describes how most paid search is billed, and many people use the two terms interchangeably.

Is SEO part of SEM?

Depends who you ask. Some definitions include it; many use SEM to mean paid search only.

How much should a small business spend on search ads?

Start with Keyword Planner's bid estimates for your top searches, decide how many clicks a month you need to test properly, and multiply. Give a test long enough to see whether clicks turn into calls before raising the budget.

See Inbound SDR