If 2025 was the year marketers panicked about what AI was going to do to their strategy, 2026 is the year they have to actually do something about it. The marketing channel landscape has shifted more in the past two years than it did in the previous decade — and the gap between which channels are growing and where most businesses are still spending is wider than it should be. This is a grounded, data-backed breakdown of the channels that are actually delivering in 2026, what the research says about each one, and what businesses of every size should understand before they finalize where their marketing budget goes this year.