# Learning about quantum bits (qubits)

In this section, we will review the building blocks of a classic bit and a few of the operations that are performed on them via classic gates. We will then learn about the fundamental unit of a quantum computer, the **quantum bit** (**qubit**), and how it is similar to the bit, yet due to its quantum computational principles has a larger computational space than the bit.

## Reviewing the classic bit

Before we delve into what a quantum bit is and how it is used, let's take a brief moment to refresh our memories on the classic bit. Just as the quantum bit is the fundamental building block of quantum algorithms, the bit has the same role in classic computational systems.

In computational systems, the bit is used to define a logical state, often referenced as either on or off, true or false, or, the most commonly used option, 1 or 0. The transition between states can be applied physically either after it's triggered by some operation such as...