The expression に比べて is used to compare two things, indicating that one thing is being evaluated relative to another. It translates to "compared to," "in comparison to," or "when compared to" in English. The verb くらべる比べる means "to compare," and に比べて is its て-form attached to the comparison target with the particle に.
Place the item being compared before に比べて, and then state how the main topic differs.
The item marked by に比べて serves as the baseline for comparison, and the rest of the sentence describes how the main subject differs from that baseline.
に比べて can also appear as に比べると, which carries a similar meaning but adds a slight nuance of "when you compare…" or "if you compare…," framing the comparison more conditionally.
In written or formal contexts, the て can be dropped to produce に比べ.