How to make cylinder more smooth by increasing amount of vertices?

If I made not enough vertices when created it, how could I fix that? Not just look smooth, but more vertices.

Check this EdgeFlow addon:

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Try subdividion surface? Or smoothing modifiers

You may want to use Bezier Curves for this, here is a tutorial on how to do it https://www.youtube.com/watch?v=Nn7mISvVzJk

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If you want to add more segments around, rather than on the curve, select the edge rings then select edge loops and subdivide. This adds more details. Then use looptools->circle to smooth them out.

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