What is web scraping?
Scraping is a process of extracting, copying, screening, or collecting data. Scraping or extracting data from the web (a buildup of websites, web pages, and internet-related resources) for certain requirements is normally called web scraping. Data collection and analysis are crucial in information gathering, decision-making, and research-related activities. However, as data can be easily manipulated, web scraping should be carried out with caution.
The popularity of the internet and web-based resources is causing information domains to evolve every day, which is also leading to growing demand for raw data. Data is a basic requirement in the fields of science and technology, and management. Collected or organized data is processed, analyzed, compared with historical data, and trained using Machine Learning (ML) with various algorithms and logic to obtain estimations and information and gain further knowledge.
Web scraping provides the tools and techniques to collect data from websites, fit for either personal or business-related needs, but with legal considerations.
As seen in Figure 1.1, we obtain data from various websites based on our needs, write/execute crawlers, collect necessary content, and store it. On top of this collected data, we do certain analyses and come up with some information related to decision-making.
Figure 1.1: Web scraping – storing web content as data
We will explore more about scraping and the analysis of data in later chapters.
There are some legal factors that are also to be considered before performing scraping tasks. Most websites contain pages such as Privacy Policy, About Us, and Terms and Conditions, where information on legal action and prohibited content, as well as general information, is available. It is a developer’s ethical duty to comply with these terms and conditions before planning any scraping activities on a website.
Important note
Scraping, web scraping, and crawling are terms that are generally used interchangeably in both the industry and this book. However, they have slightly different meanings. Crawling, also known as spidering, is a process used to browse through the links on websites and is often used by search engines for indexing purposes, whereas scraping is mostly related to content extraction from websites.
You now have a basic understanding of web scraping. We will try to explore and understand the latest web-based technologies that are extremely helpful in web scraping in the upcoming section.
