What are these slashes?? "@context":"http:\\/\\/schema.org\\/"

Super noobie to schema here, so please be gentle. What is going on with these slashes, I see in the snippet? <script type="application/ld+json"> { "@context":"http:\\\\/\\\\/schema.org\\\\/", "@id":"\\\\/products\\\\/mens-pacific-coast-highway-black-long-sleeve-crewneck-t-shirts#product", "@type":"ProductGroup",