Answer: They are those people who adopt the way of the Prophet (may Allah’s peace and blessings be upon him) and his Companions in words, deeds, and beliefs.

They are called "Ahl-us-Sunnah" because they follow the Sunnah of the Prophet (may Allah’s peace and blessings be upon him) and refrain from introducing innovations in the religion.

"Al-Jamā’ah" (group) refers to the fact that they have united on the truth, and were not divided therein.