KB is a written short form of kilobyte or kilobytes. A byte is a tiny unit of computer memory; a kilobyte is a thousand bytes — or, in an older computer habit that is still around, 1,024 bytes.

KBKB is a written short form of kilobyte or kilobytes是 kilobyte（千位元組）或 kilobytes 的書寫縮寫。A byte is a tiny unit of computer memoryByte（位元組）是電腦記憶體很小的一個單位；a kilobyte is a thousand byteskilobyte（千位元組）是一千個 byte——or, in an older computer habit that is still around或者照一個到現在還在用的舊習慣，1,024 bytes是 1,024 個 byte。

People write KB for how big a file is: a short text file might be only a few KB; a photo is often thousands of KB, which we then write as MB instead. You will see KB on file sizes, email limits, and older computer screens.

People write KB for how big a file is人們用 KB 來寫檔案有多大：a short text file might be only a few KB一個短的文字檔可能只有幾 KB；a photo is often thousands of KB一張照片常常有好幾千 KB，which we then write as MB instead這時候我們就會改寫成 MB。You will see KB on file sizes, email limits, and older computer screens你會在檔案大小、email 附件限制，還有比較舊的電腦畫面上看到 KB。

It is a writing shortcut, not something people say aloud much; in speech they usually say “kilobyte.” The letters KB can mean other things in other jobs, but in this use they only mean that small unit of computer size.

It這 is a writing shortcut是寫在紙上的簡寫，not something people say aloud much口語不太會這樣講；in speech they usually say "kilobyte."講話的時候，人們通常會說「kilobyte」。The letters KB can mean other things in other jobsKB 這兩個字母在別的領域可能有別的意思，but in this use they only mean that small unit of computer size但在這裡，它們只代表電腦裡那個小小的容量單位。