The mole is the SI base unit of amount of substance. One mole contains exactly specified entities, as fixed by the Avogadro constant. It counts entities rather than a fixed mass or volume. [ref]
https://www.bipm.org/en/si-base-units/mole. BIPM, SI base unit: mole
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The mole is a fundamental unit in chemistry used to quantify the amount of substance. It is one of the seven base units in the International System of Units (SI). One mole is defined as exactly \(6.02214076 \times 10^{23}\) entities, which could be atoms, molecules, ions, or other particles. This number is known as Avogadro's number.
