The main difference between Cherubim and Seraphim is that Cherubim are known to have four wings, and Seraphim are described with six wings. Cherubim’s main function is to help God, but Seraphim are only supposed to praise God

Cherubim or Cherubs are angels described as having four faces and four wings. But all the four faces are not of humans. The four faces are of ox, lion, man, and eagle. Their body is covered by their wings. They are known to move very fast as they use wheels.

Cherubim are described as the helpers of God. They serve the will of God. Their job is to perform divine duties on the face of the earth. As we find in the book of Genesis, they were in charge of protecting the Garden of Eden, and this is their first appearance we get. The central objective of Cherubim is to sit on the throne and attend to God. They embody the likeness of glory.
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Seraphim are angels. They sing the praise of the lord in such a loud voice that it shakes the core of the palace. They offer their worship to God. We can find seraphim In Isaiah 6:1-8 and Revelation 4:6-8

We have senior angels such as Gabriel, Michael and Lucifer who became Satan and millions and millions of Angels serve God.