Monero is the only private, untraceable, trustless, secure and fungible cryptocurrency.
There is a growing number of online goods and services that you can now pay for with Monero. Globee is a service that allows online merchants to accept payments through credit cards and a host of cryptocurrencies, while being settled in Bitcoin, Monero or fiat currency. Project Coral Reef is a service which allows you to shop and pay for popular music band products and services using Monero.
Linux, Veracrypt, and a whole array of VPNs now accept Monero.
There is new Monero only marketplace called Annularis currently being developed which has not been created for those who value financial privacy and economic freedom, and there are rumours Open Bazaar is likely to support Monero once Multisig is implemented.
In addition, Monero is also supported by The Living Room of Satoshi so you can pay bills or credit cards directly using Monero.
The use-case and features of Monero are well explained in this post: https://np.reddit.com/r/CryptoCurrency/comments/7ra409/your_...