What is ever since?

"Ever since" is a phrase that is commonly used to describe something that has been occurring or has been a certain way for a long period of time. It is usually used to trace a particular event or situation back to its initial trigger or cause. For example, someone might say "Ever since I started eating healthy, I've felt so much better," to indicate that their healthy eating habits have continued to make a positive impact on their life. This phrase is often used in everyday conversation as well as in more formal writing, such as academic papers or professional reports.