Women are more educated, marrying later and living longer worldwide but millions remain illiterate and trapped by work that pays little or nothing, according to a United Nations report on Tuesday assessing progress over the past two decades.

Despite many advances, too many obstacles remain in women's path to global equality, U.N. Secretary-General Ban Ki-moon said in releasing "The World's Women 2015," which looks at developments since a landmark U.N. conference on women held in Beijing in 1995.

"Far too many women and girls continue to be discriminated against, subjected to violence, denied equal opportunities in education and employment, and excluded from positions of leadership and decision making," he said.