What is the difference in role of a UI Designer and UX Designer

User Interface (UI) and User Experience (UX) are both an investment in the product/service and essential parts of product development and delivery. We know that customer experience drives revenue growth. If spending money does not reap the expected rewards, customers will shift their investment to a product that does. UX is made up of different components that when combined together make up the user experience, and user interface (UI) design is just one of them. The definitions of UX and UI have many things in common, so companies advertise UI and UX design as a single role, with the employee working on the conceptual part of user interactions and then transferring this knowledge into actual UI design. Each role requires a different set of skills and methods. Details about the two roles:

UX deals with the purpose and functionality of a product, is centred on market research and communications to understand client needs and focuses on project management and analysis through the entire phase of ideation, development, and delivery. As companies realize that good design is a competitive advantage, they have been willing to invest significant resources in creating a great user experience- making UX designer a high demand professional. UX design is a multidisciplinary field where designers can be involved in different areas of product development - product research, ideation, prototyping, testing. A UX designer ensures a product makes sense to the user by creating a path that logically flows from one step to the next; and need to know how to execute, facilitate and analyze research and data. UX designer’s responsibilities and desired skills usually include:
Empathy - UX design starts with extensive research to understand the target audience, their wants, and needs. Empathy is a crucial skill as it helps UX designers to understand and uncover the latent needs and emotions of the people they are designing for.
Design strategy - Includes understanding purpose of a product and mapping a logical journey. Analyzing insights for improved design solutions - Studies how people use products – their interaction habits, personal preferences, and shortcuts they use while interacting with UI.
Creating wireframes and prototypes - To propose their ideas to design team and ensure that product design is moving in the right direction.

UI deals with quality of interaction the end-user has with the product, and has an artistic component as it relates to the design and interface and affects what the user sees, hears, and feels. To create interfaces that have a good look and feel, UI designers should have graphic design, visual design, and branding design skills. They usually take the user flow and wireframes created by UX designers, turn it into something aesthetically pleasing with attention to detail for continually perfecting even tiny elements of their solutions. Good problem-solving skills and patience to spend enough time finding an apt solution are vital. A UI designer ensures each page visually communicates that path, and needs to know composition and graphic design and have a knack for palettes, typography and branding in order to make an interface shine and have its own identity. UI designer responsibilities usually include:
Competitive analysis of products and visual design decisions
Responsive design to ensure UI design looks good on any screen size and resolution.
Communication with UX designers and engineering team and competence to understand technical feasibility