The six blessing of the weekday Amidah is called Selichah ("forgiveness") and functions as a confession of sin before the LORD. Note that this part of the Amidah is only recited during weekdays (the Shabbat and Holiday versions skip this prayer).
Blessing Six: Selichah
Forgive us, our Father, for we have sinned; pardon us, our King, for we have rebelled; for You are a pardoner and a forgiver. Blessed are you, Lord, the gracious One who abundantly forgives.