English materials for
​Secondary school in México

Second Grade

Unit 1
Introduction
A public service announcement (PSA) is a message in the public interest disseminated without charge, with the objective of raising awareness of, and changing public attitudes and behavior towards, a social issue.

A public service announcement:
  • Informs the public about a cause or issue.
  • Call on viewers to take action.
  • Persuade people to help make a change.