Log into Mathletics - you'll have an activity assigned called "Venn Diagrams".
Venn diagrams are, like bar charts, a way of showing and organising information, invented by a mathematician called John Venn who they are named after.
In this Venn diagram, one circle is labelled "Multiples of 3", the other is labelled "Multiples of 2". Venn diagrams have 2 (or sometimes more!) circles which overlap - in the overlapping part are numbers that are both, which is why I've put 12 in there, because it's 2 x 6 and 3 x 4.