Silicon bridge
Beginner
A small strip of silicon with very fine wires. It is tucked under the edges of two chips to join them.
Novice
A small piece of silicon with fine wiring layers, embedded in the package substrate (or in a molded layer) under the facing edges of two dies, so only that region needs fine-pitch bumps.
Expert
Gives interposer-class wiring density between neighbors without a full interposer under every die: the rest of each die keeps coarse bumps, and power need not pass through silicon. Each link can get its own bridge; examples include Intel’s EMIB.
Explained in Packaging and chiplets (Systems).
See also: silicon interposer, Microbump.