A Study of Vedolizumab in Adults With Ulcerative Colitis (UC) or Crohn's Disease (CD) in the Community Setting

Inclusion Criteria To be eligible to participate in this study, participants must meet all the following criteria: 1. In the investigator's opinion, the participant can understand and comply with protocol requirements. 2. The participant signs and dates an electronic informed consent form (ICF) and any required privacy authorization prior to any study procedures. 3. The participant is 18 to 80 years of age at the time of signing the ICF. 4. The participant's immunization is up to date per vedolizumab US prescribing information (USPI). 5. Participants must meet the contraception recommendations. 6. The participant has a diagnosis of moderate to severely active UC or CD defined by the following: 1. CD: A Crohn's Disease Activity Index (CDAI) score of 220 to 450 and a SES-CD \>=6 (\>=4 if isolated ileal disease) at screening OR 2. UC: A complete Mayo score (MS) of 6 to 12 with endoscopy sub-score of 2 to 3 at screening. 7. UC or CD diagnosis established prior to screening by clinical and endoscopic evidence and corroborated by a histopathology report. 8. Demonstrated an inadequate response to, loss of response to, or intolerance of at least one of the following agents: corticosteroids, immunomodulators, and/or advanced therapy. Exclusion Criteria Participants who meet any of the following exclusion criteria will be excluded from participation in this study: 1. Received approved or investigational anti-integrin antibodies (i.e., vedolizumab, natalizumab, efalizumab, etrolizumab, abrilumab \[AMG 181\]) at any time prior to screening. 2. Failed (primary or secondary nonresponse) on more than 2 prior advanced treatments. 3. Use of corticosteroid enemas/suppositories within 2 weeks prior to screening (for UC and CD). 4. In the investigator's opinion, the participant meets any contraindication, warnings and precautions, drug interactions, or special population considerations per the vedolizumab USPI, or has a medical history or known allergy, hypersensitivity, or intolerance to vedolizumab or its excipients. 5. Received any investigational biologic therapy \<= 6 months prior to screening. 6. The participant has received an advanced treatment for an approved indication other than CD or UC within 60 days prior to screening. a. Advanced therapies include tumor necrosis factor (TNF) inhibitors, 12/23 antagonists, janus kinase (JAK) inhibitors, and sphingosine-1-phosphate (S1P) receptor modulators. 7. The participant has any evidence of an active infection during screening. 8. Ileostomy, colostomy, severe or symptomatic stenosis of the intestine, or short bowel syndrome. 9. A surgical procedure requiring general anesthesia within 30 days prior to screening or planned or possible major surgery during the study period. 10. History of malignancy, except for adequately treated nonmetastatic basal cell skin cancer; adequately treated squamous cell skin cancer that has not recurred for at least 1 year before screening; and adequately treated cervical carcinoma in situ that has not recurred for at least 3 years before screening. Participants with a remote history of malignancy (e.g., \>10 years since completion of curative therapy without recurrence) will be considered based on the nature of the malignancy and therapy received; this must be discussed with the sponsor on a case-by-case basis before enrollment. 11. Participants with any unstable or uncontrolled cardiovascular conditions, moderate to severe heart failure (New York Heart Association Class III or IV), pulmonary, hepatic, renal, gastrointestinal, genitourinary, hematological, coagulation, immunological, endocrine/metabolic, neurological, or other medical disorders that, in the investigator's opinion, would confound the study results or compromise participant safety. 12. Participants with active cerebral or meningeal disease, signs or symptoms or a history of progressive multifocal leukoencephalopathy (PML), or any other major neurological disorder, including stroke, multiple sclerosis, brain tumor, or neurodegenerative disease. 13. Participant is not on a stable dose of corticosteroid. 14. Has any of the following laboratory abnormalities during the screening period: (a) hemoglobin \<8 grams per deciliter (g/dL); (b) white blood cell (WBC) count \<3.0 × 10\^9 per liter (L); (c) lymphocyte count \<0.5 × 10\^9/L; (d) platelet count \<100 × 10\^9/L or \>1200 × 10\^9/L; (e) alanine aminotransferase (ALT) or aspartate aminotransferase (AST) \>3.0 × the upper limit of normal (ULN); or (f) alkaline phosphatase (ALP) \>1.5 × ULN. Historical laboratory data may be used for screening if available in the participant's electronic health record (EHR) within 6 weeks before screening.