In liability insurance, what is the difference between the 'per occurrence' limit and the 'aggregate' limit?

PER OCCURRENCE vs AGGREGATE LIMITS in liability policies: PER OCCURRENCE LIMIT: The maximum the insurer will pay for any SINGLE claim or occurrence (e.g., $1,000,000 per occurrence); AGGREGATE LIMIT: The maximum the insurer will pay for ALL covered claims COMBINED during the entire policy period (e.g., $2,000,000 aggregate); EXAMPLE: A '$1M/$2M' CGL policy pays up to $1M for any one occurrence, but no more than $2M total for all occurrences in the policy year; once the aggregate is exhausted, no more coverage that period (even if individual claims are within the per-occurrence limit); SPLIT LIMITS in auto: e.g., 100/300/50 = $100K per person / $300K per accident (bodily injury) / $50K property damage; COMBINED SINGLE LIMIT (CSL): One limit per occurrence for both BI and PD; understanding how per-occurrence and aggregate limits work together (single claim cap vs total period cap) is important policy-provision knowledge on the casualty exam — it determines the insurer's maximum exposure per claim and per policy period.