Measurement-induced　entanglement　phase　transitions　(MIETs)　highlight　how　local　measurements　drive　quantum　systems　between　area-law　and　volume-law　entangled　states.　This　review　surveys　MIET　in　free　fermion　models,　focusing　on　how　unitary　hopping　competes　with　measurement-induced　non-unitarity.　We　discuss　controversies　regarding　the　existence　of　MIET　in　one　dimension,　the　impact　of　non-Hermitian　skin　effects,　and　potential　experimental　platforms.　We　conclude　with　open　challenges,　including　feedback　control　and　higher-dimensional　extensions.