Coins that have been properly stored since the day they were minted are called "uncirculated" or "mint state." If a coin saw circulation for a short time but still looks nearly brand new, it is called (or graded) "About Uncirculated." After that, the grades in descending order are.
Uncirculated coins have different grades as well, depending on how carefully each coin was made, handled, and stored. Some uncirculated coins have heavy marks caused by contact with other coins during minting or storage. Other uncirculated coins are nearly free of such marks. The coin in the best state of preservation will almost always have the greatest value