Version control revolves around maintaining a record of your progress over time. To thoroughly examine this history, it's essential to identify the differences between two specific moments, such as the changes made between two product releases or the alterations implemented to resolve a bug. This is where TortoiseMerge comes into play—it is a diff and merge tool designed for Windows that integrates seamlessly with TortoiseSVN. Particularly for text-based files, TortoiseMerge proves to be invaluable. It displays two versions of a file side by side, highlighting every modified line with distinct colors. When you reformat your code or text, you might not make any substantial changes; instead, you might simply break a lengthy line into shorter ones or combine several lines into one. In such cases, TortoiseMerge indicates these adjustments by placing a white circle on the left gray bar of each view. If you notice a white circle, it signifies that no significant alterations occurred, merely adjustments in whitespace. This feature can significantly enhance your understanding of changes made throughout the project's lifecycle.