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One of you moves out. There is no court involvement and no legal status. You remain married, you remain responsible for each other's debts in most states, and property acquired while you are apart may still count as marital property. The date you separated can matter later, which is why it is worth being able to establish it.
A written contract between the two of you covering support, who lives where, how bills are paid and how the children's time is arranged. It is enforceable as a contract, and in many states it can later be folded into a divorce decree. It does not change your marital status and does not require a court.
A court action. You file, the court makes orders on property, support and parenting much as it would in a divorce, and a judge signs a judgment. You are legally separated and still legally married.
Not every state offers it. A few have no legal separation status at all, and others fold it into the divorce process.
A legal separation produces most of the same orders a divorce does. It can divide property and debt, set spousal support, establish a parenting schedule and set child support. Those orders are enforceable in the same way.
What it does not do is end the marriage. You cannot remarry. You remain each other's spouse for any purpose that depends on marital status.
This is the most common reason, and it needs care. A divorce ends a former spouse's eligibility on an employer plan; a legal separation sometimes does not. But many plans treat legal separation as a qualifying event that ends coverage anyway, and the answer is in the plan documents rather than in state law. Check the specific plan before relying on this, because it is the single assumption that most often turns out to be wrong.
A legal separation allows a couple to settle finances and parenting formally without ending the marriage.
Some states allow a legal separation with a shorter residency requirement than divorce, which lets you get support and parenting orders in place while you wait to qualify.
Certain benefits depend on the marriage reaching a threshold — ten years is a common one. A couple close to that line sometimes separates legally rather than divorcing.
Some couples want the financial and parenting questions settled while they decide. A legal separation does that without a final step.
Most states that offer legal separation let you convert it to a divorce. Where the separation judgment already divided property and set support, those terms are commonly carried over, which makes the later divorce considerably simpler. Some states let either spouse convert unilaterally after a set period.
Whichever route you take, the date you separated can affect which property counts as marital, how long the marriage is treated as having lasted for support purposes, and who is responsible for debts taken on afterwards.
It is worth being able to establish that date — a lease, a change of address, a dated written exchange. Couples who continue to share a home while separated should be especially careful here, because a court may not accept a date it cannot see evidence for.
Warning: This post is neither financial, health, legal, or personal advice nor a substitute for the advice offered by a professional. These are serious matters, and the help of a professional is recommended as it can impact your future.