What is a matchmaker in Jewish?

A shadchan is a matchmaker. The correct term for a Jewish matchmaker is shadchanit for a woman, shadchan for a man.

Why cant Jews shave their beard?

The custom of religious Jews wearing beards is rooted in a passage in the Biblical book of Leviticus that forbids “destroying” beard edges and prohibits shaving with a blade. While Jewish law permits the use of electric razors or scissors to trim beards, some sects dont shave at all.