The Mishneh Torah and the Mishnah

Shalom to you all.

I am not a Jew, but I am very interested in learning about the Torah and the teachings inside it. So I did some research about books that talk about the Torah and I many times, the Mishneh and Mishnah were mentioned a lot.
What is the difference between these two books, and where can I download the english version of the Mishneh Torah.

Thanks in advance.