Truth-value link~(All'Infinito - Noemi)

spilling crimson says.... The principle of truth-value links is a concept in metaphysics discussed in debates between philosophical realism and anti-realism. Philosophers who appeal to truth-value links in order to explain how individuals can come to understand parts of the world that are apparently cognitively inaccessible (the past, the feelings of others, etc.) are called truth-value link realists.

The truth of a statement do not attribute a property called truth to such a statement.There are sentences...in which the word "truth" seems to stand for something real; and this leads the philosopher to enquire what this "something" is. Naturally he fails to obtain a satisfactory answer, since his question is illegitimate. The word "truth" does not stand for anything, in the way which such a question requires.For example ...

It is worthy of notice that the sentence "I smell the scent of violets" has the same content as the sentence "it is true that I smell the scent of violets". So it seems, then, that nothing is added to the thought by my ascribing to it the property of truth. (Frege, 1918).

Truth has a variety of meanings and among them the idea of having fidelity to an original or to a standard or an ideal.
To recognize a" truth", we use some method such as a "criterion of truth".Since there is no single accepted criterion,there all can be considered as theories of truth.