Same-sex marriage is when two people of the same gender (like two men or two women) want to get married and have the same rights and benefits as married couples of different genders (like a man and a woman).
Some people used to think that same-sex marriage wasn't okay or wasn't allowed, but over time, more and more people have come to believe that everyone should have the right to marry who they love, no matter their gender.
In some places, like the United States, same-sex marriage is now legal and recognized by the government, which means that couples can get married and have their marriages respected and protected by the law.
However, in other places, like some countries or states, same-sex marriage is still not legal or recognized, which means that couples may not have the same rights and protections as other married couples.
Overall, the status of same-sex marriage varies depending on where you are in the world, but many people believe that everyone deserves the right to love and marry who they choose.