What are -moz- and -webkit-? [duplicate]

by 
-webkit-column-count: 3;
-webkit-column-gap: 10px;
-webkit-column-fill: auto;
-moz-column-count: 3;
-moz-column-gap: 10px;
-moz-column-fill: auto;

I am a beginner at CSS and when I was looking at some CSS code the other day, I found these lines. In the tutorials I used to learn CSS, I have never seen anything like these lines. What is the explanation for these lines? Or is there a source where I could learn to implement lines like these?

2 Answers
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