About English word: sticky?

What is a sticky training?

Is it a good training?

What does it mean when the word "sticky" is used in a positive sense?
Update: For confidentiality reasons I cannot cite the document in which I found this phrase, but I googled it and found the following website:

https://trainingindustry.com/articles/content-development/sticky-training-how-to-keep-the-enthusiasm-and-learning-going-once-employees-are-back-at-work/
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