I define it in a few words, but especially in images (because a picture is worth a thousand words).
While you are doing your daily life, you find many details, situations and things you can shoot to capture a concept:
When you go out for a walk
When you travel
Going to work
When you are with family and friends
In your own home
Then, with a good retouch you give an attractive look to this concept (that moment) that you have photographed, and you get a final image that can be used by designers, bloggers, journalists…. in their professional work.