You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Barrett's esophagus is - and explain in detail?
Barrett's esophagus

Is the metaplastic change, of gastroesophageal mucosa from normal squamous epithelium to columnar epithelium, in response to chronic gastroesophageal reflux.
The function between squamous esophageal mucosa and gastric mucosa moves proximally
Three types of columnar epithelium have been described in Barrett's esophagus :

1. Intestinal type - the most common type
2. The junctional type and
3. The gastric Jaundice type

Barrett's esophagus is a premalignant condition for adenocarcinoma esophagus
The hallmark of intestinal metaplasia is the presence of intestinal goblet cells.