As you start down the road of learning Drupal 8 module development, one of the first new Drupalisms that you're likely to encounter are plugins. After writing a blog post about creating blocks, which uses the new plugin architecture, I thought it might be interesting to take a step back and talk a little bit more about plugins at a higher level. This blog post contains an introduction to the what and why of plugins to help Drupal 7 developers make the transition to Drupal 8.