Instructor led training is traditional classroom based training.
The instructor has a defined syllabus and leads the class through the syllabus using a number of techniques including presentation, demonstration and questioning.
Learning is reinforced by the use of practical examples. The benefit of this type of training is that training is conducted face to face.
At any point any member of the class is able to ask the instructor a question either to re-enforce a learning point or to hear a concept explained differently to facilitate understanding.