Same-sex marriage refers to the legal union between two individuals of the same gender. This type of marriage grants couples the same legal rights and responsibilities as heterosexual couples, including matters related to taxation, inheritance, and healthcare. The recognition of same-sex marriage varies by country and region, with some places fully legalizing it while others still prohibit it. The movement for same-sex marriage gained significant momentum in the late 20th and early 21st centuries, leading to landmark legal decisions and legislation. In the United States, the Supreme Court's ruling in Obergefell v. Hodges in 2015 legalized same-sex marriage nationwide, affirming the rights of LGBTQ+ individuals to marry.