Basically it means "to be" or "is".
But their sentence structure is different so it's at the end of the sentence.
それは猫です Sore wa neko desu That's a cat.
彼の名前はなんですか Kare no namae wa nan desuka What's his name?
ケンです Ken desu It's Ken
Ather use of です is an auxiliary verb which is more polite way to express sentenses than "-だ”
これは車です。Kore wa kuruma desu It's a car
これは車だ。 Kore wa kuruma da It's a car
It's also be used as a polite expression in adjective ending:
楽しいです Tanoshii desu I enjoy it/ It's fun
It's not only for females but also for males. When people introduce themselves, they speak in polite way, therefore you can hear "desu" at the end of sentenses.
Most commen sentenses for introducing yourself are:
はじめまして Hajime mashite Nice to meet you
私はXXXです Watashi wa xxxdesu My name is xxx
私は学生です Watashi wa gakusei desu I am a student
私は３３歳です Watashi wa 33sai desu I am 33 years old
私は日本人です Watashi wa nihonjin desu I am Japanese
私は東京出身です Watashi wa tokyo shusshin desu I am from Tokyo
よろしくお願いします Yoroshiku onegai shimasu I hope to have a good relationship with you
I hope it helped you a bit ：) Good luck！