It refers to the combination of online and supervised workshop training where the knowledge theories are conducted through the internet and the supervised workshop training are conducted face to face.
Source: TESDA 2010, Philippines

Blended learning is a teaching and learning approach that demonstrates blend of different methods, technologies, and resources to improve student learning. Some examples of blended learning are flipped classroom, online interaction followed by face-to-face teaching, online learning supplemented by face-to-face practical, etc.
Source: COL 2015, Global

A formal education program in which a student learns at least in part through online delivery of content and instruction with some element of student control over time, place, path and/or pace, and at least in part at a supervised brick-and-mortar location away from home.
Source: Staker/Horn 2012, USA