The remaining captures are the number of times URLs (web pages) and HTML snippets can be converted to images, PDF's, DOCX, videos, icons, rendered HTML, spreadsheets, CSV's, and JSON. Additionally this includes online videos to animated GIF conversions.
The number of remaining captures is reset on your renewal date. Web Monitors do not effect this limit. The number of remaining captures is also not affected by scraping unless you specifically call the screenshot functionality from within the Web Scraper.
If you go over your limit you cannot make anymore captures until your package renews, or you buy the same or another package.