Truth is just a word, it has varying definitions depending on context.
Truth can be an eyewitness testimony they believe is true. That doesn't mean it is factual. Eyewitnesses are notoriously fallible and memories can morph over time.
Truth can be a scientific theory. It is the best explanation we have for certain events but it is possible to invalidate by presenting a better explanation.
Truth can be a mathematical axiom. Something that is true regardless of interpretation. It is very likely that other species or other intelligent life will have come to the same axioms such as the speed of light in a vacuum, the age of the observable Universe, the Planck constants and other absolutes.
Truth can be a religious statement. It's just so because a religious leader says it's so. It is the weakest form of facts and evidence.