Here's a breakdown:

* Chemical Formula: A symbolic representation of a chemical compound using chemical symbols and numerical subscripts to indicate the number of atoms of each element in the compound.

Here are some examples:

* H₂O: This formula represents water, indicating two hydrogen atoms and one oxygen atom.

* NaCl: This formula represents table salt, indicating one sodium atom and one chlorine atom.

* C₆H₁₂O₆: This formula represents glucose, indicating six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.

Formulas can also represent:

* Empirical Formula: The simplest whole-number ratio of atoms in a compound.

* Molecular Formula: The actual number of atoms of each element in a molecule.

* Structural Formula: A representation of the arrangement of atoms in a molecule.

Let me know if you want more details about any of these types of chemical formulas!