Commonly in photography the men and women behind the camera niche. That is they select an area of preference and become an expert in it. It becomes the focus of their offerings and the subject they photograph the most.
Many new photographers will jump through many specialty areas trying to find the ones that they prefer and enjoy. Sometimes they inherently know and sometimes they are curious to try numerous areas and techniques to discover that perhaps what they thought they’d enjoy really wasn’t what they came to specialize in.