Which of the following solids has the greatest number of faces?

1. Determine the number of faces for each solid

Option (1): A triangular prism has $2$ triangular bases and $3$ rectangular faces, giving $5$ faces in total.
Option (2): A square pyramid has $1$ square base and $4$ triangular faces, giving $5$ faces in total.
Option (3): A cylinder has $2$ circular flat faces and $1$ curved surface, giving $3$ faces in total.
Option (4): A cuboid has $6$ rectangular faces.

2. Compare the number of faces to find the greatest

Comparing the number of faces: $6 > 5 > 3$.
The cuboid has the greatest number of faces ($6$).