UI is the actual interface of the webpage. it is the physical representation of a webpage functionality.UX (User Experience)
User experience deals with the emotions of the user. it relates more to how the user will feel or react when presented with certain options within the UI.
The process of designing the user experience is divided into three phases:
Meet with key stakeholders to set vision.
Develop usability goals and objectives.
Look at competitive products..
Begin to brainstorm design concepts and metaphors.
Develop screen flow and navigation model.
Work closely with delivery team as design is implemented.