A marriage certificate gives:
marriage date and place
names of the bride and groom, their ages, their marital "condition" (single or widowed), their professions, and their residences at the time of the marriage
names and occupations of their fathers (and sometimes whether they were deceased)
signatures or marks of the bride, groom, and witnesses
also notes whether the bride and groom were married in a church (with the denomination given) and, if so, whether they were married by banns or by license.