Why we write is a really good question. Written languages evolved primarily to preserve information and to transmit the information across time and space. When you start to wonder, you will find that Writing exists in our daily life and it effects all of our lives. First, let us talk about the writing of our daily, normal writing is like filling out forms, making lists, sending cards, communicating at work through electronic way, and maybe some people would like writing poems or stories. Next, talk about the formal education part, writing serves a cognitive function, which helps people to develop our thinking, reasoning skills, an argument or position and support it with evidence. In language learning, writing even helps to reinforce oral language development.