UI stands for User Interface Design – User interface refers to the point of interaction between a user and their device – such as the touchscreen on their smartphone or tablet, or the mouse or keyboard on their laptop. User interface design is about incorporating buttons, menus, icons, etc. to make a website or mobile application as intuitive to navigate as possible.
UX stands for User Experience Design – User experience refers to all points of contact between the user and the company. User experience design focusses on how the interaction makes the customer feel and respond to the company. Design elements include colours, shapes, videos, graphics, as well as functionality and speed of your website. It is about how all these elements interact together to create an overall impression of the company.