If a couple has been married for less than two years at the time of green card approval, then the spouse will receive a CR1 green card (or “conditional green card”).
Conditional green cards are valid for only two years. Couples must jointly file another petition before the expiration of this two-year period in order to “remove the conditions” and obtain a permanent green card. For more details about the conditional green card and the petition to remove conditions, see this article.
If a couple has been married for more than two years at the time of green card approval, then the spouse will receive an IR1 green card (or “immediate relative green card”) — a permanent green card that is valid for 10 years. In most cases, renewing this 10-year green card is a simple process, and does not require the couple to prove the authenticity of their marriage again.