# When is a space Lindelöf?

Topological space is Lindelöf if every of its open covers has a countable one. Or equivalently every system of closed elements with countable intersection property has non empty intersection.

There exists a characterization for metric spaces: Metric space is Lindelöf if and only if it is separable or (and) second-countable.

Are there any other interesting characterizations or sufficient conditions for a space to be Lindelöf?