If you "update" something, you change it from something old to something new. This word is often used for homes, clothing, cars, offices, stores, websites, etc.
They’re updating their office with new carpeting and new furniture.
Tanya’s kitchen hasn’t been updated in years.
Jim needs to update his wardrobe. (He needs new clothes.)
I need to update my calendar.
This website is updated daily.
The examples above use the word "update" as a verb, but you can use it as a noun, too:
Can you give me an update on the situation? (Give me any new information you have.)
Your computer needs to check for updates on a regular basis.
There’s a new update for this program if you want to download* it.
A news update provided the latest information about a big storm approaching our area.
download: get something (information, pictures, audio, video, programs) from the internet