The original meaning of DJ is "disco jockey", that is, record knight.
But now this term has been widely and meticulously applied to various entertainment activities, and wedding DJ is on the rise.
Wedding DJs are generally served by radio DJs and dance DJs. Not the owner upstairs.
The task of the wedding DJ is to choose the appropriate music to set off the exquisite links according to the environmental factors and personal preferences on the wedding day. Simply put, it is to design and play music at the wedding. This link can also be completed by the band, but the cost is higher.
I hope my answer will satisfy you, hehe, I'm a DJ.