What is the difference between naoh (s) and naoh (aq) ?

In NaOH (s), the sodium hydroxide is present in solid state because (s) represents solid state of a substance.

This also means that there is strong force of attraction between sodium and hydroxide ions due to which they are bonded together.

In NaOH (aq), the sodium hydroxide is present in aqueous state because (aq) represents aqueous state.

This also means that in NaOH (aq) there are sodium and hydroxide ions are present in the solution.

NaOH (s) is in solid state and NaOH (aq) is an aqueous solution.