* Centrifuges: Iran would reduce its total of about 19,000 centrifuges -- 10,000 of which are still spinning today -- down to 6,104 under the deal, with only 5,060 allowed to enrich uranium over the next 10 years. Centrifuges are used to enrich uranium, the material necessary for nuclear power -- and nuclear bombs.
* Uranium enrichment: Iran's centrifuges will only enrich uranium to 3.67% -- enough for civil use to power parts of the country, but not enough to build a nuclear bomb. That agreement lasts 15 years. And Tehran has agreed not to build any new uranium enrichment facilities during that time period. The 3.67% is a major decline, and it follows Iran's move to water down its stockpile of 20% enriched uranium last year. In addition, Iran will reduce its current stockpile of 10,000 kilograms of low-enriched uranium to 300 kilograms for 15 years.
* Breakout time: The period of time it would take for Iran to acquire material necessary to make one nuclear weapon, currently assessed at two to three months, would be extended to about one year. That year-long breakout period would be in place for at least 10 years.
* Fordow facility: Iran's Fordow nuclear reactor would stop enriching uranium for at least 15 years. It will not have fissile material at the facility, but it will be able to keep 1,000 centrifuges there. Fordo, one of the country's biggest reactors, is buried more than 200 feet under the side of a mountain and was hidden from the international community until the U.S. revealed it in 2009.
* Research and development: Iran can continue its research and development on enrichment, but it will be limited to keep the country to its breakout time frame of one year. Though Iran will be required to make changes at a number of its facilities -- including reducing centrifuges and rebuilding a heavy water reactor in Arak -- the country will get to maintain its current facilities.
* Inspections: Iran will be required to give International Atomic Energy Agency inspectors 24/7 access to all of its declared facilities. That includes access to Parchin, an Iranian military facility related to its nuclear program. Western countries have been seeking unfettered access throughout Iran, not just declared facilities, as Iran has previously conducted nuclear work in secret.
* Sanctions lifted: The United States and the European Union will lift their nuclear-related sanctions on the Iranian economy. If there are violations, the sanctions will snap back into place. U.N. sanctions will be lifted when Iran completes its nuclear-related steps, as outlined in a new Security Council resolution.
Here is a guide to the Iran nuclear deal.