Madrassas are religious schools that teach Islam, with an estimated 20,000 in Pakistan. They provide free education for poor students, teaching them to read and recite the Quran. However, extremism and sectarianism can grow in some madrassas' curriculum and culture. There are also reports of lack of oversight and even child abuse in some madrassas. Functionalists argue madrassas still serve an important function by providing education to many with few options, but critics call for reforms like compulsory registration and standardization to address these issues.