ONA

ONA is the short term for original net animation - know in Japan as web anime and it refers to an animation that is directly released onto the Internet.

Did you know that the series Hetalia: Axis Powers is considered an ONA, because each episodes last for a few minutes ?

In the beginning of the 2010's most ONA's were series with short episodes in length, but in the second half of the decade there are now full series available on network streaming services like Netflix or Amazon Prime Video