What gets wetter and wetter the more it dries?" is an example of a tricky riddle that plays on contradiction. The answer is "a towel."
While the answer to a riddle can simply be called an answer, the term "solution" is also applicable. Either term is usually acceptable, although the type of riddle helps delineate which word is best for the riddle in question.
You can find answers to riddles at GoodRiddlesNow.com or at BrainDen.com. Both GoodRiddlesNow and BrainDen have many different riddles to look up and see the answers to.
Riddles are essentially word puzzles that use metaphors to describe something very specific. Riddles can also be jokes that are plays on words. These usually take the form of question and answer, for example, "Why was the picture sent to jail?" The answer is that it was framed.
One well-known riddle in Western literature is that of the sphinx: "What moves forward on four legs in the morning, two legs at noon and three legs at night?" The answer is man, who crawls in infancy, walks as an adult and uses a cane in old age.
"Who am I" riddles are guessing games in which the person guessing must identify the person or animal described. When the subject is a person, sometimes it is a famous person in history, someone from pop culture or just a person known to everyone who plays.
An example of a short riddle is, "Brothers and sisters I have none but this man's father is my father's son. Who is the man?" The answer is the man is the riddle teller's son. Another riddle is, "Who can travel around the world while staying in a corner?" The answer is a stamp. Another riddle says,
The answer to the riddle "What is too much for one, enough for two but not enough for three?" is "a secret." The riddle refers to the fact that when one person has a secret, he is desperate to tell someone about it; but when three people know it, it is no longer a secret.
Some riddles about love include: "What makes grown men cry, but humanity would go extinct without it?" and "What causes a sudden increase in heart rate, a loss of memory and overall brain function, but is not a drug?" The answer to both is "love".
The answer to this riddle is a mirror. Whatever is put in front of the mirror will be turned around in the reflection seen, but the mirror does not move.