I don’t speak a lick of Japanese but I found this online:

です is used to mark words as polite if they cannot conjugate to show politeness themselves… です is one of the most fundamental words in the Japanese language. It’s super useful — it can be attached to just one other word to form some basic sentences. It’s also quite safe to use since it’s part of the polite form, so you’re unlikely to offend someone with this word… です can be tacked onto the end of a noun, な-adjective, or い-adjective to form a polite, positive, present tense sentence (say that ten times fast 😉). In other words, it allows us to talk about something that is true, and relevant to the present moment and/or the future—all in a polite way of course.

source: https://www.tofugu.com/japanese-grammar/desu/