The drug being tested in this prospective, observational study is called vedolizumab. Vedolizumab is being used to treat people who have UC or CD. This study will look at the long-term safety of vedolizumab versus other biologic agents in participants with UC or CD. The study will enroll approximately 5000 participants. All participants enrolled in this will belong to one of the two treatment group:
* Vedolizumab
* Other Biologic Agents -adalimumab, certolizumab pegol.
Golimumab and infliximab. Study drugs will be prescribed by the physician according to local prescribing information in the participating countries. This multi-centre trial will be conducted worldwide. The overall time to participate in this study is 7 years. Participants will make visits at every 6 months to their treating physician.
