What is meant by a fund?

I found your book online. Here is that paragraph:

With that context, it's clear that "funds" just means money. If you need money for just a few weeks or months, you go to the "money market" for it, for your short term funds. In contrast, if you need money for a long time (say to buy or build a big office building or factory) you go to the capital market. The word "requirements" in this paragraph doesn't mean rules or regulations, but simple need. A company needs or requires some money for whatever reason. How long will you need to borrow it for? That establishes which market you go to for it.

I expect the rest of the chapter will go into more detail about both of these markets and how they work, but the author chose to start with the fact there are two markets and this important distinction between them. As you read the rest of the chapter, this paragraph will make more sense to you.