Many cryptocurrency projects are simply abandoned. You may have stored in your wallet a cryptocurrency or token that is practically forgotten by you and no less than its own creators.

Abandonment or fraud may lead to death of a cryptocurrency
Some and not a few projects were just scams to take some values of unsuspecting people who act out of emotion and greed, making them totally blind and do not research before investing in any project. The deadcoins website is a great place for you to research some projects that are no longer with us.
Wondering if that dusty crypto in your wallet is still alive? Be sure to search and find several dead cryptocurrencies.
I hope this little article can help you!