Why are there words? This was because humans needed to record and express their thoughts, feelings, and events. Words were first invented by ancient humans to represent various concepts and things with symbols and graphics. These symbols could be simple marks, symbols, or combinations of marks used to record and convey information. As time passed, words gradually became the main way for humans to communicate and communicate, and developed rich forms and grammar rules. Why does this world exist? Because the universe was made up of all kinds of matter and energy, it contained life, civilization, history, and other colorful phenomena. The origin and evolution of the universe is an important research topic in physics, astronomy and other scientific fields. Through the exploration and observation of the universe, mankind gradually revealed its mystery and wonder. At the same time, human understanding and cognition of the world was also based on the understanding of matter and energy. These understandings and explorations also provided the foundation and guarantee for the development and application of the world.