A user journey is, colloquially in the UK and parts of the US, the experiences a person has when utilizing/interacting with something (typically software). This idea is generally found in user experience circles around web design and how users interact with software experiences. It is often used as a shorthand for the overall user experience and set of actions that one can take in a software/virtual experience.
User journeys describe at a high level of detail exactly what steps different users take to complete a specific task within a system, application or website. This technique shows the current (as-is) user workflow, and reveals areas of improvement for the to-be workflow.
User journeys are focused on the user and what they see and what they click on, in comparison to the related term click path which is just a plain list of the text URLs that are hit when a user follows a particular Journey.