Observational means based on watching and noticing things carefully rather than doing experiments or taking direct action. When scientists conduct observational studies, they observe what naturally happens without interfering. For example, an ornithologist might spend months making observational notes about how eagles build their nests, watching from a distance without disturbing the birds.

This approach differs from experimental science, where researchers actively change conditions to test ideas. In an experiment, you might grow two identical plants and water one more than the other to see what happens. In observational research, you'd watch plants in nature and record what you notice about how they grow under different conditions.

The word also describes people who are naturally good at noticing details. Someone with strong observational skills picks up on things others miss: they notice when a friend seems quieter than usual, or they spot patterns in how different teachers give tests. Sherlock Holmes was famously observational, solving mysteries by noticing tiny clues that others overlooked.

Observational learning happens when you learn by watching others rather than being directly taught. A younger sibling might learn to tie shoes by watching their older brother, or a student might improve their basketball shot by observing how skilled players position their hands.