What does extended spring training mean?

Описание: What does extended spring training mean?
A typical scene from an extended spring training game, which are played on practice fields in front of few fans. ... Simply put, extended spring training is an extension of spring training for players that weren't assigned to one of an organization's four full-season minor league teams at the conclusion of spring training.

Reference:
Extended Spring Training - Spring Training Connection
https://www.springtrainingconnection....
May 24, 2019