What is a 'Module Not Found' error and why does it occur when trying to resolve 'moment'?

A 'Module Not Found' error indicates that your project is trying to import a module (in this case, 'moment') that Python or your JavaScript runtime environment cannot locate. This often happens when the module isn't installed, the installation path isn't in your system's PATH environment variable, or there's a typo in the import statement. For 'moment', it's a common JavaScript library for working with dates and times, so the error suggests it's not installed in your project's dependencies.