Your permanent residence status is conditional if your marriage was less than two (2) years when you received your green card. You are given conditional resident status on the day you are lawfully admitted to the U.S. on an immigrant visa or adjustment of your status to permanent residence. The reason your status is conditional is because you have to prove that you did not get married just for a Green Card. To remove the conditions, you need to file USCIS Form I-751, Petition to Remove Conditions on Residence.
You must apply together with your spouse to remove the conditions on your residence. In some cases, such as divorce or abuse, the joint filing requirement can be waived. You should apply 90 days before your second anniversary as a conditional resident. Your green card expires on your second anniversary as a conditional resident. If you do not file to remove the conditions before your second anniversary, you could lose your conditional resident status and be removed from the U.S.
We have years of experience helping conditional permanent residents remove the conditions on their green cards and to obtain a permanent green card.