UC stands for “unified communications”. Think of this as your phone system, only more. Instead of simply handling phone calls, a unified solution can handle everything: phone calls, web conferences, faxes, chat, and more.
Hosted means the system leverages the power of the internet by locating itself in the cloud, rather than existing on premise in a physical device. You might also hear this being called “cloud-based”.

Since your system is in the cloud, it is decentralized, making it less vulnerable to physical disasters. For example, even if your office is flooded and loses power/internet, your company can still receive phone calls though mobile and desktop apps in other locations. Even if no one is available to answer due to the emergency, the hosted system will still be able to receive the call and route it to a voicemail, auto attendant, or other destination of your choice, ensuring that you never miss a call.

Hosted solutions can also be serviced much more efficiently. Rather than having to wait for your vendor to physically send a technician to your office, you can receive instant remote support. This is because your vendor always has access to the system through the internet, allowing them to immediately troubleshoot any issues and make near-instantaneous programming changes.
They also offer the ability to provide all your services on one platform. Traditional solutions force you to pay third party companies for access to many vital services like eFax or video conferencing. By using a hosted solution, you can combine these services into one platform, saving time and money. It can improve your daily efficiency since your staff will not need to learn how to use multiple computer programs or websites to juggle all the different services your business needs access to.