Edge loop selection

I am seeing everywhere that to select an edge loop, we must press alt and then select the edge and it will select all edges in the loop. Well, consider the default cube when you open a new file. Click alt and select one of its edges. it is selecting only that edge, not the loop it is connected to. what am i missing? and how can i select an edge and all the connected edges in that loop will be selected?

The default cube is made up entirely by 3 edge poles, there are no loops.
Triangles and ngons will also break edge loops (not the case with the default cube)

If you subdivide the cube you will get loops in the middle.
Edge loops (as the name suggests are LOOPS)

You can also select edge loops by double clicking an edge (that is in a loop).

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