Ethnography is a type of qualitative research which involves putting yourself in a particular community or organisation and observing the behaviour and interactions up close.
User experience refers to everything a person interacts with when engaging with a customer, eg a website, a mobile app and a kiosk. We can think of user experience as the “what” - what users see when they interact with a brand.
Service design is the planning and organising of resources to deliver a good customer experience. This can be the how-how the user experiences gets created, and how internal parts of the business make a seamless experience. Poor service design will lead to a negative customer experience.
To have a good design, we and service design must work together; we have to look at what the users encounter, but we also have to look at the experience being given. A service blueprint is are visual map that matches the user's actions with the internal services design, This can be good to identify the weak spots, which will improve both customer and employee satisfaction.
https://www.nngroup.com/articles/service-blueprints-definition/
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A service blueprint is a diagram that visualises the relationships between different service components — people, props (physical or digital evidence), and processes — that are directly tied to touchpoints in a specific customer journey. - Sarah Gibbons
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