A 3-sphere, like its 2D analogue the ordinary sphere, permits indefinite travel without boundary while possessing finite volume, making finite-yet-unbounded space formally coherent.

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2D analogue(as used in mathematics and geometry): A simpler, lower-dimensional version of something that works the same way—like how a circle on paper is the 2D version of a sphere in real life.
3-sphere(as used in geometry and cosmology): A four-dimensional version of a sphere—just like a regular sphere is a 2D surface wrapped around 3D space, a 3-sphere is a 3D surface wrapped around 4D space that we can't easily visualize.
Finite volume(as used in geometry): Having a measurable, limited amount of space inside—you could theoretically measure how much 'stuff' fits in it.
Finite-yet-unbounded space(as used in cosmology and the philosophy of space): A space that has a limited total size but lets you travel infinitely without ever reaching an edge (like traveling around Earth: it's not infinite, but you never hit a boundary).

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