In the context of California's eviction legal process, the UD-105 Answer to Unlawful Detainer form is used by tenants as a formal response after receiving a summons and a UD-100 Unlawful Detainer Complaint from the landlord. This situation typically arises when a landlord initiates an unlawful detainer action to evict a tenant for reasons such as non-payment of rent or a breach of the lease agreement. - **Receipt of the Summons and Complaint**: This is a pivotal moment where the landlord officially starts the eviction process by filing these documents with the court, which will serve as a formal notice to the tenant. - **Non-Compliance with Tenant Agreement**: Non-compliance situations could range from not paying rent to otherwise violating terms of the lease. - **Notice to Quit**: A previous step where the landlord may have issued a notice to the tenant demanding resolution of the issue or to vacate the property. Once triggered by the service of the summons and complaint, tenants must act promptly, usually within five days, to file the UD-105 form. This response allows them to deny the allegations, assert defenses, and provide a venue for potentially resolving the disputes in court.