Lava is molten rock that oozes out of Hawaiian Volcanoes. Depending on conditions, there may be lava present at the surface of active lava flows or in lakes inside active volcanic calderas. You can see what's going on with active lava flows and volcanic calderas from the Hawaiian Volcano Observatory webcams.

lava seen on 2016-11-30 on 61g at Kamokuna (license: cc0)

Halema'uma'u Overlook Vent 2016-11-30 (work of the US federal government, presumed public domain)