When a company says they have a "100-qubit quantum computer," it means they have built a physical chip containing 100 individual quantum bits.
At the start of a program, these qubits usually sit in a completely unentangled, base state (all zeros).
As the quantum program runs, the computer uses quantum gates to entangle specific pairs or small groups of qubits to perform calculations.
A 100-qubit quantum computer has the potential to entangle combinations of those 100 qubits to map out a massive computational space (2^{100} states), but it does not mean all 100 are permanently locked in a giant entangled web.
