The Arabic and Hebrew alphabets have similarities because they are both derived from the Aramaic alphabet, which in turn derives either from paleo-Hebrew or the Phoenician alphabet, both being slight regional variations of the Proto-Canaanite alphabet used in ancient times to write the various Canaanite languages (including Hebrew, Moabite, Phoenician, Punic, et cetera).
The Arabi.c and Hebrew alphabets have similarities because they are both derived from the Aramaic alphabet, which in turn derives either from paleo-Hebrew or the Phoenician alphabet, both being slight regional variations of the Proto-Canaanite alphabet used in ancient times to write the various Canaanite languages (including Hebrew, Moabite, Phoenician, Punic, et cetera)