Used to indicate that something is done or decided according to a certain standard, data, rule, or source. Often follows a noun.
This movie was made based on a real incident.
Please make a decision based on the data.
Attributive form used to modify nouns directly, e.g., 法律に基づく手続き (procedures based on the law).
From the verb 基づく (もとづく, 'to be based on') in its te-form, combined with the particle に.