compared to~; in comparison to~
This pattern compares two things, saying one is [adjective] compared to the other.
に比べて is used to state a comparison, often in written or formal spoken Japanese. It follows a noun and sets up the standard of comparison. For example, 日本に比べて、アメリカは広いです means 'Compared to Japan, America is big.' The pattern highlights a difference, and the predicate usually describes the subject with an adjective or statement of degree.
You can also use に比べて with numbers or quantities to express relative differences, like 去年に比べて、今年は暑いです. In casual conversation, より is more common, but に比べて sounds more objective and analytical, so it is frequent in reports, essays, and news.