The Anglican Church was formed when Henry VIII wanted to divorce his wife for political reasons and the pope said no. Because this split was more political than theological, there are still a lot of similarities between Anglicans and Catholics. Both believe in the life, death, and resurrection of Jesus. Both believe in his Real Presence in the Eucharist. Both have all 7 sacraments. The Masses are extremely similar, almost identical. There are a few differences, however:
1. Authority of the Pope - Catholics believe the pope is infallible when speaking with the authority of Peter on religious matters. Obviously Anglicans don't. Also, the Pope has greater authority over the Catholic Church than the Archbishop of Canterbury has over the Anglican one. Anglican Laymen have a more prominent voice in Church decisions than their Catholic counterparts.
2. Divorce - Anglicans recognize it and allow remarriage. Catholics believe divorce is not religiously possible and therefore remarriage would be a sin.
3. Contraception and Abortion - Anglicans have no problem with contraception, Catholics believe only in natural family planning. Anglicans permit abortion in the case of rape or incest or when the mother's life is in danger. Catholics see abortion as the murder of an infant whatever the circumstances.
4. Clergy - Anglicans permit women clergy and there is debate about homosexual clergy as well; Catholics permit neither.
5. Mary - Catholics believe in the Immaculate Conception (Mary was born without sin) and the Assumption (when she died, she rose bodily into heaven). Anglicans are permitted to believe or not believe in these doctrines as they see fit.