Rule 150 “Hearsay evidence” is defined in Section 1200.

This rule is simply a pointer to another rule. If you want to know what "hearsay evidence" means, you need to look at Section 1200 of the California Evidence Code.

Hearsay is an important concept in court cases, so the code sets aside its own section to explain it fully. Think of this rule as a sign saying "see there for the full answer."