I am going through Flask source. I see a lot of statements like

```
from . import x

```

I am not Python novice so I understand what `from` and `import` keywords do. But what is `from .` ? Could someone explain with an example?

Edit1:
My question is about just `import .` not `import .module`

Edit2:
how is `from . import x` different from from `import x`