Powers of the Ring

The chief power (of all the rings alike) was the prevention or slowing of decay (i.e. ‘change’ viewed as a regrettable thing), the preservation of what is desired or loved, or its semblance – this is more or less an Elvish motive. But also they enhanced the natural powers of a possessor – thus approaching ‘magic’, a motive easily corruptible into evil, a lust for domination. And finally they had other powers, more directly derived from Sauron (‘the Necromancer’: so he is called as he casts a fleeting shadow and presage on the pages of The Hobbit): such as rendering invisible the material body, and making things of the invisible world visible.

-Tolkien, J.R.R.. The Silmarillion. HMH Books. Kindle Edition.