An edge is where two faces meet.
Imagine a box containing a new mobile phone.
The left hand face of the box has 4 edges (front, back, top and bottom) and the right hand face has also 4 edges.
But there are 4 more edges where the front meets the top, the top meets the back, the back meets the bottom and the bottom meets the front.
This makes 12 edges in total.
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a cuboid has 12 edges
a cuboid has 6 faces, and it has 12 edges.
12 edges.
12 edges.
A cuboid has 12 edges, 8 vertices and 6 faces