What is the importance of Malaikah?
Muslim's believe Allah's greatness mean he does not communicate directly with humans, so he passed messages, risalah, to his prophets via the angels.
Angels also tell Allah about the behaviour of humans
‘Each person has angels before him and behind, watching over him by God’s command’- Surah 13:11
Muslims are taught to respect the Malaikah of Allah: when Muslims end their prayers they turn to the left and right and say "peace be upon you" to the angels (and anyone else they are praying next to)