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A sphere is round - like a tennis ball. A torus is ring-shaped - like a donut !
Topology is the study of objects (often surfaces in 3D) where details like position, shape and curvature are unimportant. Two topological objects are considered equivalent if they can be stretched to look like one another. An example of two different topological objects are a sphere and a doughnut shape (torus); the sphere cannot be stretched to look like the torus because it doesn't have a hole and the torus does.
A sphere or torus (a donut).
Sphere, torus, moebius strip
A blob, an ellipsoid, a torus (doughnut), a sphere