All or nothing, yes or no

Question

Here is a simple riddle for you:

I stand for nothing but I am everything, with 100%.

There are ideas wanting to replace me with something that can stand for more but can't even decide what it is.

I stand for information but I can only answer a yes/no question.

I am contained in this riddle but you cannot see me.

The romans only knew half of me but nowadays I am more important than ever.

Who am I?

Answer 1

You are:

A Bit

I stand for nothing but I am everything, with 100%.

You can be 0 or 1, nothing or everything.

There are ideas wanting to replace me with something that can stand for more but can't even decide what it is.

Quantum computing may be the future, and literally involves uncertainty (superposition)

I stand for information but I can only answer a yes/no question.

Bits are the basis of all info, but only have 2 states

I am contained in this riddle but you cannot see me.

I'm reading this on a computer

The romans only knew half of me but nowadays I am more important than ever.

Romans had a common concept of 1 but not zero