An extractor is a software tool or utility designed to retrieve or extract specific data, information, or files from a larger set or source of data. It operates by identifying and isolating the desired content from within a structured or unstructured dataset, enabling users to access, manipulate, or use that extracted information separately.
Extractors can handle both structured data (e.g., databases with defined formats) and unstructured data (e.g., text from web pages or documents) by employing techniques like web scraping, text parsing, regular expressions, or data manipulation algorithms.
Extractors find applications in data mining, business intelligence, web scraping, information retrieval, content aggregation, data integration, and other fields where accessing specific data elements from larger datasets is essential. But, they are also seen as spam related programmes designed to locate and compile email addresses from web pages, online discussion forums, advertising Internet databases. A process which is also known as harvesting emails.