Strawberries are not berries. Bananas, avocados, and watermelons are.
Botanically, a berry is a fruit developed from a single flower with one ovary, with the seeds embedded in the flesh. By this definition: bananas, avocados, grapes, tomatoes, kiwis, and watermelons are all berries. Strawberries, raspberries, and blackberries are not — they're 'aggregate fruits' formed from multiple ovaries. Similarly, almonds and coconuts are technically drupes (stone fruits), peanuts are legumes, and cashews are seeds attached to a pseudo-fruit. The culinary and botanical definitions of 'berry' are almost completely incompatible.
The botanical definition of 'berry' is so counterintuitive that it actively includes things no one considers berries and excludes things everyone calls berries. It's one of the clearest examples of how scientific definitions can diverge completely from everyday language.
“Strawberries are not berries (botanically). Bananas, avocados, tomatoes, and watermelons are. Botanically, a 'berry' comes from one ovary with seeds in the flesh — which rules out everything people think of as berries. 🍓🍌 #OddlyHuman”