Stream in Java 8

Hello Everyone, Can anyone explain to me what is a Stream? How does It differ from a collection? Actually, I am preparing some topics for the java 8 interview and I have doubts regarding this. If anyone knows please suggest me.

A stream represents a sequence of elements and supports different kind of operations to perform computations upon those elements:

List<String> myList =
    Arrays.asList("a1", "a2", "b1", "c2", "c1");

    .filter(s -> s.startsWith("c"))

// C1
// C2