For all practical purposes, they can be assumed to be parallel but, strictly speaking, they are very slightly divergent.
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kinds of lines
Rays aren't really lines, since (Euclidean) lines extend infinitely in all directions, so they can't be parallel lines. But that's to fret a bit too much over the wording. Yes, rays, just like lines and line segments, can be parallel to other rays, lines, or line segments.
segments, lines, and rays.
Concurrent lines.
Skew lines, parallel lines or an angle.