As developers we tend to find the quickest way to get things done, if you are also trying to find quick way to download and enable module in drupal then read on ...

Normally we use the following commands for downloading and enabling module

drush dl {module} - For donwloading the module
drush en {module} - For enabling the module

Both the above command can be executed using a single drush "pm-enable(en)" command as below

drush en module_name -y

This will download and enable module.