Hello! If you think about the word social, it has to do with other people. In the definition above, it states that they learn from other "people." So if you take that into effect plus knowing the definition personally, it explains the exact same thing in that definition. The Social Learning Theory is when people learn from other people which fits the description almost exactly. So this should leave you with your answer!
I hope this helped!
I am, yours most sincerely,
SuperHelperThingy