What is it?

User experience design (UXD or UED) is the process of enhancing customer satisfaction and loyalty by improving the usability, ease of use, and pleasure provided in the interaction between the customer and the product.

UX is important in any medium.

As a scientific process it could be applied to anything, street lamps, cars, Ikea shelving and so on.

What UX designers do:

Strategy and Content

Wireframing and Prototyping

Execution and Analytics

What is it?

User Interface Design is its compliment, the look and feel, the presentation and interactivity of a product.

What is it used for?

Responsible for the transference of a product’s development, research, content and layout into an attractive, guiding and responsive experience for users.

What UI designers do:

Design Look and Feel of a site

Branding and Graphic Developement

Interactivity and Animation

Adapting for multiple devices

Working Together

UI is a part of UX, without each other, they fall apart.

Are you UX or UI?

Make sure you're specializing in the right thing!

If you prefer creating

"Who would want a flawless looking hamburger if it has disgusting taste?"

If you prefer designing a whole project

"Who would want a perfectly made cheeseburger if it looks like rubbish?"

The reference article:

meli_b on medium.com