Search Engine Marketing (SEM) Guide
1. Introduction to SEM
Search Engine Marketing (SEM) primarily refers to paid advertising on search engines. Unlike SEO (which is organic), SEM involves paying for visibility. The most common form is PPC (Pay-Per-Click) advertising.
SEO vs. SEM
| Feature | SEO (Organic) | SEM (Paid) |
|---|---|---|
| Cost | Free (time investment) | Paid (per click/impression) |
| Speed | Slow (months) | Instant (hours) |
| Sustainability | Long-term results | Stops when budget stops |
| CTR | Generally higher | Generally lower |
2. Google Ads Structure
Success in Google Ads comes from a well-organized account structure.
- Account: The top level (associated with email/billing).
- Campaign: Where you set the budget, location, and objective (e.g., "Summer Sale").
- Ad Group: Contains a set of related keywords and ads (e.g., "Men's Running Shoes").
- Keywords: The terms you bid on to trigger your ads.
- Ad: The actual text/image users see.
3. Keywords & Match Types
Controlling when your ad shows up is critical to saving money.
- Broad Match (
running shoes): Ads show on potential matches, synonyms, and related searches. High reach, low relevance. - Phrase Match (
"running shoes"): Ads show on searches that include the meaning of your keyword. Good balance. - Exact Match (
[running shoes]): Ads show only on the exact meaning of your keyword. Low reach, high relevance. - Negative Keywords (
-free): Excludes your ad from specific search terms (e.g., "free running shoes").
4. The Auction System (Ad Rank)
You don't just pay to be #1; you have to earn it. Google uses Ad Rank to determine position.
Ad Rank = Max CPC Bid × Quality Score
Quality Score (1-10)
A diagnostic tool meant to give you a sense of how well your ad quality compares to other advertisers.
- Expected CTR: How likely is someone to click?
- Ad Relevance: Does the ad match the user's search?
- Landing Page Experience: Is the page relevant, fast, and easy to navigate?
Higher Quality Score = Lower Cost Per Click (CPC) & Higher Position.
5. Bidding Strategies
- Manual CPC: You set the maximum amount you're willing to pay for a click.
- Maximize Clicks: Algorithm tries to get as many clicks as possible within budget.
- Maximize Conversions: Optimizes for actions (sales, leads).
- Target CPA (Cost Per Action): Set a target cost for each conversion.
- Target ROAS (Return On Ad Spend): Optimizes for revenue (e.g., earn $5 for every $1 spent).
6. Ad Extensions (Assets)
Add more information to your ad to increase visibility and CTR (at no extra cost).
- Sitelink Extensions: Links to specific pages (e.g., "Contact Us", "Sale").
- Callout Extensions: Additional text (e.g., "Free Shipping", "24/7 Support").
- Call Extensions: Phone number.
- Location Extensions: Business address.