"Numbers" is the Apple spreadsheet. If you can't find it on your Mac then download it from the App store - it's free.
My 2p: if you're an expert/power Excel user then you might find Numbers a bit......erm.....annoying and if you've already got a load of Excel files and want to crack on and just use them then Numbers might not be what you want. I tried it but gave up quickly cos I needed to work, not learn a new spreadsheet. Libre Office works fine for me, it's free and it even runs Excel macros (you need install a java runtime on the Mac - not hard - GIYF).
Best of luck whichever you choose.