The state of wanting to know or learn about something with others. Interests can become hobbies and hobbies can become expertise over time with attaining specific requirements, certifications, or licensing.

An activity one participates in regularly with their leisure time for pleasure. One may pursue these activities alone or with others.

If one is an expert, they have expert skill or knowledge in a particular profession or field of practice; one with expert skill is typically licensed and/or certified within a profession or field of expertise.