Is entanglement an operation or a stored state for qubits?

I am going through this video of Quantum Computing for Computer Scientists. I am not able to understand the entanglement state of qubits.
Is entanglement just an operation, or is it a state which can be stored. If it's a state which is stored then how can we send two qubits far apart? But if it is just an operation then isn't the operation somehow affected the probability from 50% to 100% to superimposed states of qubits.
Also, what if the operation has 50% chance of assigning the probability. So when measuring multiple times we tend to get 50% probability of qubits collapsing to one of the states.

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