Hamas is a Palestinian group based in the Gaza Strip. It has a political wing and an armed wing. Both are actively struggling for Palestinian independence.
Founded in 1987, Hamas has been a counter group to the Palestinian Liberation Organization (PLO) and has been internationally shunned as a terrorist organization because its military wing periodically attacks Israel and its citizens.
Palestinian Prime Minister Rami Hamdallah is visiting Gaza to negotiate a Hamas-Fatah unity government. But Netanyahu has said Hamas needs to make three specific concessions for Israel to accept any eventual deal.