Answer: Internet
Explanation: The Internet is the most effective resource for getting the outside data that businesses require.
Access to a wealth of information on a variety of subjects, including market research, industry trends, competitor analysis, and consumer behavior, is made possible through the Internet. Additionally, businesses can access real-time news and data on the internet to stay informed about the most recent developments in their industry.
While books and libraries can also offer useful information, the Internet offers quicker and more convenient access to information, making it the most effective method for businesses to gather outside data. The internet offers a wider variety of information, whereas software is often more specialized and focused on specific activities. The software can be valuable for collecting and analyzing data.