"What a beautiful world" is a phrase that can refer to different things, including the title of a song by Louis Armstrong, "What a Wonderful World". The song is about the beauty of the world and the simple things in life that make it wonderful, such as blue skies, white clouds, and the colors of the rainbow. It also talks about the love and kindness that people show to each other, and the growth and learning of children. The song has endured over time and has been covered by many artists).