Most and The most
What difference is between "most + adjective" and "the most + adjective"?
I often can see both in texts, but I can't find any explanations anywhere.
I know that superlative form is "the most + adjective" (the most beautiful )or "the + adjective ends in EST" (the largest).
This exercise is most difficult in the book.
This exercise is THE most difficult in the book.
The biggest and most popular market in London takes place every day in Camden, but it is busiest and best at the weekend. There is no article in the second part .