Tech e&o insurance protects you when clients blame your software or services for costing them money. The insurance covers legal defense costs, judgments and settlements when clients sue over software bugs, system crashes or missed deadlines.
Most tech e&o coverage bundles errors and omissions with cyber liability insurance, so you're protected from both professional slip-ups and data breaches in one claims-made policy (coverage applies when you report the claim, not when the incident happened).