Depending on what you wanted to say, I would probably change it to either: 1) Art is a means of expressing creativity. (Meaning: art is one of the ways of expressing creativity). 2) Art is the means of expressing creativity. (Meaning: art is the way of expressing creativity).

U can say that art is the way to express creativity

Hello, You are close but the word should be "means" The word "means" in this case is a noun, meaning "a way of doing something". Its plural and singular form are both "means". So your sentence should be, "Art is the means to express creativity." I want to also comment on the feeling of this sentence. To say "the means" somewhat implies "the only means". This sentence could also be contrasting art with something else, such as writing or music. As in, "Music is fun, but art is the means to express creativity." In that example the emphasis of the phrase is more on the contrasted thing (not music, but art), so "only" isn't as much implied, but it still kind of has that feeling. So depending on your intention, you may want to instead say, "Art is one of the means to express creativity." (one of many equal ways) or "Art is a means to express creativity." (same as above) or "Art is one of the best means to express creativity." (a very good way) instead. Or if you actually mean "the only" then go ahead and put an emphasis on that in order to clear up any ambiguity. "Art is the only means to express creativity." (art is better than any other way, it is impossible or nearly impossible without art) or even more clear, "Art is the only means to express ones creativity." "Art is the only means to express ones own creativity." (as apposed to someone else's) The last two examples are because it is implied in the previous examples (and your original sentence) that a person uses the means of art to express his or her own creativity. Not that, for example, a museum expresses creativity by displaying art, which is something that could also be meant by your original statement. However, most people wouldn't assume that meaning. It could also mean a person expresses someone else's creativity, but again, that doesn't make much sense. However, changing it to "ones creativity" or "ones own creativity", shows the intended meaning more clearly.