This is a Makki Surah.  It was revealed most probably sometime before the Hijrah of Abyssinia.  It has 75 verses in 8 sections.

The Surah talks about the true religion. It is to serve Allah sincerely and to avoid Shirk.  Tawhid brings the blessings of Allah, while Shirk has terrible consequences.  The Believers are told not to despair and lose heart.  If it is difficult for them to practice their religion in one place, they can migrate from that land.  The unbelievers are told that they can do whatever they wish, but they cannot turn the Believers away from the path of faith.

Recitation: Shaykh Mishaari Raashid & Ibrahaim Walk using Saheeh International Translation. Thematic introduction: Dr. Muzammil H. Siddiqi.