Wing tip vortices are dangerous horizontal "tornadoes" that emirate from the wingtips rearward. They are most pronounced when the aircraft is slow and "dirty" (full flaps). They can roll a following aircraft inverted quickly. Here is a tragic, but good video on them and an surprising producer.
https://www.youtube.com/watch?v=KXlv16ETueU
Biz jets need to be careful of them at altitude when passing close to the cruise path of a heavy. Can wreak havoc on the smaller jet. Search for the Challenger Jet damage occurred after they hit the vortices from an Airbus A380 in the Middle East.
Here is another good video. Lots of them out there explaining this.
https://www.youtube.com/watch?v=dfY5ZQDzC5s