Keyword (Amazon PPC)

A keyword in Amazon PPC is a string of one or more words an advertiser explicitly adds to a campaign as a bidding target. When a shopper's search term matches the keyword (under the rules of the chosen match type), the ad enters the auction.

The keyword is what you bid on; the search term is what the shopper actually typed. The two are not the same thing, and conflating them is the single most common source of confused PPC analysis.

Keyword anatomy

Three dimensions categorise every keyword:

• Specificity. Single token (headphones) → compound (bluetooth headphones) → long-tail (noise cancelling bluetooth headphones for sleeping). Specificity correlates with intent and CVR.
• Brand context. Branded keyword (your brand name), competitor keyword (a rival brand name), or generic (no brand name).
• Funnel position. Top (broad category words, low CVR, awareness), mid (category + descriptor, moderate CVR), bottom (long-tail or branded, high CVR).

Where keywords come from

Four sources every mature account uses:

1. Search Term Reports from broad and auto campaigns (keyword harvesting).
2. Search Query Performance in Brand Analytics — Amazon-published top queries by ASIN.
3. Product Opportunity Explorer — emerging category-level demand.
4. Reverse-ASIN tools — third-party tools that surface keywords competitors rank for.

Brainstorming as the only source is a beginner anti-pattern. Brainstorming as the starting input that the four data sources then refine is correct.

Keywords vs. search terms — the canonical distinction

A single broad-match keyword can generate dozens of search terms in one week. The keyword wireless earbuds (broad) might be matched against wireless earbud, best wireless earbuds, wireless earbuds for sleeping, bluetooth wireless earbud 2024, and so on. Each is a search term; the keyword is one.

Bidding decisions get made on keywords. Harvest and negation decisions get made on search terms. Mixing the two vocabularies leads directly to mixing the data.

Keyword count: how many is enough?

Three rules of thumb for a single SKU:

• Discovery layer. 5–15 broad seed keywords per ad group. More than 20 makes the STR unreadable.
• Profit layer (harvested exacts). As many as the harvest produces — typically 20–80 active exacts per SKU after 90 days of harvesting.
• Branded layer. 5–25 exact branded keywords (your brand + top branded long-tails).

An account with 500 keywords on a single SKU is not "well-covered" — it's noisy. An account with 50 well-chosen keywords on a single SKU usually outperforms.

Common mistakes

• Treating "keyword" and "search term" as synonyms. Bid on keywords; harvest from search terms.
• A single mega-ad-group with hundreds of keywords. Negatives, bids, and ACOS targets all become unmanageable.
• No negative keyword cycle. The most common cause of rising ACOS in a "stable" account.
• Bidding on every keyword you can think of. Quality of keyword selection beats quantity by an order of magnitude.