Why do Catholics believe in purgatory and indulgences?

Why do Catholics believe in purgatory and indulgences? Will you explain them to me?

These links should explain the Catholic Church’s teaching of Purgatory and indulgences. If you have any further questions or concerns that are not answered by this, please contact Catholic Answers directly.
Recommended Reading:

[LIST]
]"He will come again to judge the living…"
]
How can we know a doctrine is true if it’s not in the Bible?**
]* Purgatory**
]* The Roots of Purgatory (Fathers*)**
*]Myths about Indulgences
*] HOW TO GAIN AN INDULGENCE
*]How to Get an Indulgence
*]Primer on Indulgences
*] CATECHISM OF THE CATHOLIC CHURCH ON INDULGENCES
[/LIST]

DISCLAIMER: The views and opinions expressed in these forums do not necessarily reflect those of Catholic Answers. For official apologetics resources please visit www.catholic.com.