You're talking about template literals.
They allow for both multiline strings and string interpolation.
Multiline strings:
console.log(`foo_x000D_
bar`);_x000D_
// foo_x000D_
// barString interpolation:
var foo = 'bar';_x000D_
console.log(`Let's meet at the ${foo}`);_x000D_
// Let's meet at the bar