# jupyter > Web application to create and share documents that contain code, visualizations and notes. > Primarily used for data analysis, scientific computing and machine learning. > More information: . - Start a Jupyter notebook server in the current directory: `jupyter notebook` - Open a specific Jupyter notebook: `jupyter notebook {{example.ipynb}}` - Export a specific Jupyter notebook into another format: `jupyter nbconvert --to {{html|markdown|pdf|script}} {{example.ipynb}}` - Start a server on a specific port: `jupyter notebook --port={{port}}` - List currently running notebook servers: `jupyter notebook list` - Stop the currently running server: `jupyter notebook stop` - Start JupyterLab, if installed, in the current directory: `jupyter lab`