It's handy to make a package list from your conda virtual environment in case you install something that breaks it or you want to replicate the packages exactly on a new virtual environment.
To save the package list to a file just perform this command in your activated conda environment:
conda env export > conda_env_package_list.yml
Should you need to recreate it you can delete the old one and just use this command to recreate the env exactly like it was when the package list was exported:
conda env create -f conda_env_package_list.yml