I hadn’t heard the term page parking before reading Page Parking: Millennials’ Multi-Tab Mania. Page parkers open several tabs in succession, as part of the same task. This is frequently done to gather several options that will later be compared. While this behavior isn’t exclusive to millennials, Nielsen Norman Group’s research shows that they are more likely to do it than other users.
In addition to going into some depth about this page parking behavior, the NNG article lists 7 guidelines to follow to support this behavior. As with most solid guidelines, they benefit parkers and non-parkers alike.