What it means
Instead of simply firing or not firing, Google''s tags read the visitor''s consent state and adapt. With Consent Mode v2 you set a default state, then update it the moment the user accepts or declines. When analytics consent is denied, Google models the missing conversions from aggregate patterns.
Why it matters
Without it, a privacy-first cookie banner can blow a hole in your data the day you launch it. Consent Mode keeps measurement and ad optimisation working while respecting PDPL/GDPR — the difference between compliant and blind.