How is espresso different from drip coffee?

Espresso uses pressure (9 bar) and a very short brew time (25–30 seconds) to extract a concentrated shot. Drip coffee uses gravity and a much longer brew time (4–6 minutes) to produce a larger, less concentrated cup. Espresso has more dissolved solids and caffeine per ml, but a full cup of drip coffee typically has more total caffeine due to larger volume. The flavors are also distinct — espresso is richer, more syrupy, and more intense.