What is an ISA wrapper?
In this context, a ‘wrapper’ is really just another word for a container. Generally speaking, all the investments you hold inside a wrapper are treated in a particular way. So, if the wrapper has special tax advantages, all the investments inside it would share those tax advantages. (The same would apply to a pension wrapper, for example.) So, when people talk about ‘wrapped’ or ‘unwrapped’ investments, ‘unwrapped’ investments are just ordinary investments without any special tax treatment.