If innate immunity is mentioned might be good to also mention PAMPs and PRR as they are important concepts.

uworld:
Pathogens that evade the body's external innate defenses (described in the previous concept) are quickly met by internal innate defenses. Like external defenses, internal innate defenses are not directed at specific pathogens, but rather respond to a broad range of microorganisms, potentially harmful foreign substances, and abnormal (eg, cancerous) body cells.

Some body cells possess receptors called pattern recognition receptors (PRRs), which bind to classes of molecules called pathogen-associated molecular patterns (PAMPs). PAMPs are typically present on microorganisms and viruses but not on healthy human cells. Binding of PAMPs to PRRs results in the activation of internal innate defenses