笔记本 (bǐjìběn) refers to a notebook used for writing or, in modern usage, a laptop computer (short for 笔记本电脑). Context determines which meaning is intended — in academic settings it usually means a physical notebook, while in technology contexts it refers to a laptop.
我把上课的内容都记在笔记本上了。
wǒ bǎ shàngkè de nèiróng dōu jì zài bǐjìběn shàng le.
I wrote down everything from class in my notebook.
他刚买了一台新笔记本,特别轻薄。
tā gāng mǎi le yī tái xīn bǐjìběn, tèbié qīngbáo.
He just bought a new laptop; it's especially light and thin.
你能借我一个笔记本吗?我忘带了。
nǐ néng jiè wǒ yī gè bǐjìběn ma? wǒ wàng dài le.
Can you lend me a notebook? I forgot to bring mine.