Repentance in the Qur'an

Chinese Islamic Terms Dictionary

I began to wonder just now if there is anything in the Qur'an about apologies.  The concept of the apology seems to me a very Christian notion.

I searched on "apology" and Qur'an but found nothing.

I then searched on REPENTANCE and Qur'an, and found only the above Chinese dictionary of Islamic terms, which seems quite interesting.

It mentions the 9th Surah as the Surah of Repentance.

I suspect that this google entry is part of their controversial project to scan all books into a search engine.  They are concentrating on books not under copyright while the courts sort out copyright infringement allegations.