[jQuery] Explaining this or .this or .this()

[jQuery] Explaining this or .this or .this()


There is a concept I am struggling with and I am not sure how to
approach it. I am trying to understand:
.this
I don't know if an explanation or an example would be best. But I want
to understand it.
I have tried to read an explanation and it doesn't make sense.
Can someone help me?
Frank