They make up the fourth Section of the Scouting family. There are many types of Explorer Scout Units, some may be linked to your local Scout Group, others may be based around different activities.
Not all Units meet each week, because you will often be out and about at weekends or in the holidays doing activities. There will be times when you will be busy doing other things such as exams, and being an Explorer Scout will have to fit around these.
As an Explorer Scout, you will get the chance to work with other Explorer Scouts in your District, not just your Unit. By doing this, you will get the chance to do many more actvities, not just the ones your Unit organises.