Recurring leads are meant for events or jobs that are scheduled to repeat either until a set date or indefinitely. It makes it easier on you by adding the new leads for each repeated event as they are occurring to minimize your data entry. Additionally, we use this information to properly track availability even if those future leads have yet to be created.
Recurring leads will trigger auto emails and other processes that would naturally occur. However, you can filter out these recurring leads if you want. You can use the Lead Type column. Values for a normal lead are Event and for a recurring lead, Recurring.