'ModuleNotFoundError' occurs when Python cannot find a module you are trying to import. Ensure the module is installed and available in your environment, or check for typos in the import statement.

Encountering a 'ModuleNotFoundError' in Python can be frustrating, as it indicates that the interpreter is unable to locate a specified module during an import operation. To resolve this error, first verify that the module is correctly installed in your Python environment. Use pip list to check if the module appears in the list of installed packages. If it’s not installed, you can easily add it using pip install module_name. Next, double-check the spelling of the module name in your import statement, as a simple typo can trigger this error. Additionally, ensure that your script is being executed in the correct environment; if you are using virtual environments, activate the appropriate one before running your script. If the module is part of a package, confirm that the package structure is correctly set up and that you’re importing the module using the right path. By following these steps, you can effectively troubleshoot and resolve ModuleNotFoundError issues in your Python projects.