The adjective virtual is used to describe something that exists in essence but not in actuality.

Is virtual an adjective or adverb?

In effect or essence, if not in fact or reality; imitated, simulated, substantial.

What type of word is virtually?

Virtually is the adverb form of the adjective virtual, which is most generally used to describe something as being the same as something else in almost every way, except perhaps in name or some other minor, technical sense.