This is a prospective, observational, multicenter study conducted in adult patients with ulcerative colitis (UC) or Crohn's disease (CD). The study plans to recruit 300 subjects in the United States and Canada in which the participating physician has decided to treat with INFLECTRA. The study will evaluate treatment patterns, adherence, disease activity, remission status, relapse status, treatment satisfaction, and healthcare resource utilization. Patient outcomes will be assessed at four time points (quarterly) for approximately 52 weeks after the decision to initiate treatment with INFLECTRA.