Linked from
The 13 pages that link to Eutectic system, each with the reason it gives.
Phase diagramBroader topic: The eutectic point is a distinctive landmark in binary diagrams.
SolderRelated: Eutectic solder can change directly between solid and liquid at a single temperature.
PhaseRelated: Its phase diagram displays a distinctive invariant point and coexisting phases.
Fractional freezingRelated: Eutectic behavior can limit how far a mixture separates by freezing.