Yes, the philistines, I'm not a native english speaker. What do you mean what are the "sea peoples"? How can you not know one of the darkest episode in world's history?
The Philistines who, in the 12th century BCE and under Egyptian auspices seeking truce after years of bloody wars, settled on the coast of the region they gave the name to, Palestine, are counted among the Sea Peoples by most researchers. Egyptian inscriptions call them “Peleset” while Hebrews called them "Plishtim" - philistines. Much suggests that they are of Greek origin. It is conceivable that the Philistines were in fact Mycenaeans and involved in the invasions and wars that destroyed the Hittites and brought an end to pharaonic Egypt's golden age.
Sea Peoples, any of the 7 groups of aggressive seafarers who invaded eastern Anatolia, Syria, Palestine, Cyprus, and Egypt toward the end of the Bronze Age, especially in the 13th century bce. They are held responsible for the destruction of old powers such as the Hittite empire. Because of the abrupt break in ancient Middle Eastern records as a result of the invasions, the precise extent and origin of the upheavals remain uncertain. Principal but one-sided evidence for the Sea Peoples is based on Egyptian texts and illustrations; other important information comes from Hittite sources.
Tentative identifications of the Sea Peoples listed in Egyptian documents are as follows: Ekwesh, a group of Bronze Age Greeks (Achaeans; Ahhiyawa in Hittite texts); Teresh, Tyrrhenians (Tyrsenoi), known to later Greeks as sailors and pirates from Anatolia, ancestors of the Etruscans; Luka, a coastal people of western Anatolia, also known from Hittite sources (their name survives in classical Lycia on the southwest coast of Anatolia); Sherden, probably Sardinians (the Sherden acted as mercenaries of the Egyptians in the Battle of Kadesh, 1299 bce); Shekelesh, probably identical with the Sicilian tribe called Siculi; and Peleset, generally believed to refer to the Philistines, who perhaps came from Crete and were the only major tribe of the Sea Peoples to settle permanently in Palestine.
After all the chaos associated with the invasion of the Sea Peoples, what emerged c.1100BC were the Philistine Pentopolis, the 12 Tribes of Israel, Phoenicia, Aram-Damascus, Ammon, Edom and Moab.