Have you ever seen orbs in photos or videos, what do you think they are?

You have presented a very interesting subject. Some ghost chasers and paranormal investigators claim that orbs are manifestations of departed human spirits. They say that as some ghosts seek to communicate with the living, the ghosts will exert psychic energy to make their presence visible, at least on film. From a Christian point of view, this theory has a major problem: there are no such things as ghosts, in the sense of “departed spirits of once-living humans.” The Bible teaches that when a person dies, he or she is immediately in one of two places, heaven or hell (Luke 16:22–23). There is no time for “wandering” or “haunting.” There are spirits in this world, however—[u]unclean spirits (demons) and angels, and the Holy Spirit.[/u]

Some Christians believe that orbs are real. If they see an orb in a picture taken inside their home, they conclude that there are spirits in the house. If they believe the spirits to be demonic, they might call a pastor or priest over to “cleanse” the house or pray through the rooms. If they believe the orbs are good, they might take comfort in the fact that God has sent His angels to watch over them. Again, from a biblical perspective, these theories have a problem. The Bible never mentions orbs. It never hints that spirits, good or bad, will manifest themselves to us as spherical globes of light. The belief that an orb is an angel or demon “caught on film” is based on ideas that do not come from the Bible.

If it’s not science, it’s superstition. Use Occum's Razor and go with the most likely. Dust particles are plausible.

https://www.youtube.com/live/Glw76YKuWCY?feature=shared

https://youtu.be/rO_M0hLlJ-Q?feature=shared