User Interface is the point of human-computer interaction and communication in a device. It can also be simplified as what the user would equip to interact with a website
This could include:
Screens to display information
Keyboards to type your information
Mouse to navigate the cursor through your screen
There are also various different user interfaces which include:
Graphical user interface
Command-line interface
Menu-driven interface
Touch-user interface as displayed on your phone
Voice user interface like the voice recording in your social messaging apps
form-based user interface like the contact page on a website
natural language interface
User Experience is more focused on the loading time of a page, the aesthetic appearance of the website.
User Experience to online websites when they would want to keep user traffic within their website. In fact, a one-second delay in page load time has been shown to cause a 7 percent loss in conversion and 11 percent fewer page views. For an online store earning $50,000 a day, that one-second delay adds up to more than $1 million in lost sales each year
