“Gaza is in essence a refugee camp (about 70 percent of those living in Gaza come from families displaced from the 1948 war) and an open-air prison, according to human rights groups. The United Nations describes the occupied territory as a “chronic humanitarian crisis.” Israel has blockaded Gaza since Hamas assumed control of the territory in 2007, and neighboring Egypt to the south has also imposed severe restrictions on movement.
Between them, Israel and Egypt monitor the entry and exit of all people, vehicles, and goods. They have not allowed enough construction materials and humanitarian items into the occupied Gaza Strip to enable the battered territory to rebuild from recurring episodes of deadly Israeli bombardments that are allegedly meant to target Hamas, but that often include civilian death tolls in the very dense territory.”
https://www.vox.com/2023/10/7/23907912/israel-palestine-conflict-history-explained-gaza-hamas