Definition
A code walkthrough is a guided, narrated explanation of source code, typically delivered in video or presentation format, where the presenter walks viewers through the logic, architecture, implementation decisions, and trade-offs of a codebase or feature. Unlike a code review, which focuses on finding issues, a walkthrough is educational — its purpose is to help the viewer understand how something works and why it was built that way. Code walkthroughs are among the most valuable types of developer content because they transfer tacit knowledge that documentation alone cannot capture: why one approach was chosen over alternatives, what constraints shaped the architecture, where the known limitations are, and how the pieces fit together. Producing high-quality code walkthroughs traditionally requires significant effort — planning the narrative arc, recording clean footage, editing out mistakes, and adding voiceover explanations. VidNo automates this entire process by analyzing your screen recording and git diff to construct a logical narrative, then generating a voiceover that walks viewers through your code with the same insight you would provide manually.