A divorce petition (sometimes called a complaint for divorce) is the document that formally starts the case. It identifies both spouses, states the grounds for divorce, and lays out what the filing spouse is asking the court to order.
Grounds vary by state
Most states allow no-fault divorce, typically citing irreconcilable differences or an irretrievable breakdown of the marriage, which avoids having to prove fault. Some states still allow fault-based grounds — the petition needs to state whichever applies correctly under your state's law.
State exactly what you're asking for
The petition should specify the relief sought — division of property, custody arrangements, child or spousal support, and name restoration if applicable. Leaving relief vague or incomplete can limit what the court considers later in the case.
Residency and jurisdiction requirements
Courts require the filing spouse (and sometimes both spouses) to meet a minimum residency period in the state and county before a petition can be filed. Filing before meeting that requirement can get a case dismissed and delay the whole process.
What happens after it's filed
Once filed, the petition has to be formally served on the other spouse, who then has a set window to respond. Getting the petition right the first time — accurate facts, correct relief requested, proper formatting — avoids delays that come from amending it later.