Match types: broad, phrase, and exact — and why broad match burns budget

A keyword by itself doesn't say how closely a search has to match it — match type does. This is one of the highest-leverage settings in the entire account, and one of the most commonly misunderstood.

Broad match: the widest, and the riskiest

Keyword (broad match): coffee subscription

Can match:
"coffee subscription"
"best coffee gift subscriptions"
"monthly tea delivery"          ← genuinely unrelated, still eligible
"how to start a coffee shop"    ← different intent entirely, still eligible

Broad match — a keyword entered with no modifiers at all — is the default, and it's matched using Google's own interpretation of intent and relevance, which can extend surprisingly far from the literal keyword. It can occasionally surface a genuinely valuable search a narrower match type would have missed entirely, but it's also the match type most responsible for wasted spend on irrelevant searches, especially for an account without a solid negative keyword list (part 12) already in place to catch the drift.

Phrase match: the words, in order, plus context around them

Keyword (phrase match): "coffee subscription"

Can match:
"best coffee subscription"
"coffee subscription for gift"
"coffee subscription reviews"

Won't match:
"subscription for coffee lovers"   ← wrong word order

Quotation marks mark a keyword as phrase match — the exact phrase has to appear, in that order, though additional words can surround it. This is a meaningfully tighter net than broad match while still allowing natural variation in how people actually phrase a search.

Exact match: the tightest control

Keyword (exact match): [coffee subscription]

Can match:
"coffee subscription"
"coffee subscriptions"              ← close variants (plurals, minor misspellings) still included

Won't match:
"best coffee subscription"
"coffee subscription gift"

Square brackets mark exact match — despite the name, it's not literally limited to the identical string; Google still allows "close variants" (plurals, common misspellings, word reordering with the same intent) but excludes any additional words, unlike phrase match. This is the tightest control available, and it's what most of Bright Leaf Coffee's highest-intent, highest-value keywords should eventually move toward once real performance data (part 4's Search Terms report) confirms which specific phrases actually convert.

A real, worked comparison

Ad group "Coffee Subscription — General" (Bright Leaf Coffee)

Broad:  coffee subscription           → wide reach, higher waste risk
Phrase: "coffee subscription"          → balanced reach and relevance
Exact:  [coffee subscription]          → narrow, highest-intent, most predictable

A common, effective real-world pattern: start a new ad group with phrase and exact match on the core, proven keywords, and use broad match cautiously, if at all, paired with an already-solid negative keyword list and close monitoring of the Search Terms report in the first weeks — not as a default first choice for a brand-new campaign with no data yet.

Next: the ad itself — writing search ad copy that earns the click once a search has matched, using Bright Leaf Coffee's actual ad group structure.