Your team is exploring a new market segment. The PM's first instinct is to schedule user interviews. That is the right instinct, eventually. But before you talk to a single user, someone has probably already studied your problem. Industry reports exist. Competitors have published blog posts about their approach. App store reviews reveal what users love and hate about existing solutions. Reddit threads contain unfiltered complaints. All of this is available in hours, not weeks.
Desk research, also called secondary research, is the practice of gathering and synthesising existing knowledge before conducting original research. It is the fastest way to build context, avoid reinventing the wheel, and ensure that when you do talk to users, you ask smarter questions.
The Core Idea
Desk research uses existing sources: industry reports, academic papers, competitor products, public data, blog posts, app store reviews, community forums, and analyst publications. It is distinct from primary research, which involves collecting original data through interviews, surveys, and usability tests. Desk research does not replace primary research. It precedes and informs it.