This is a court order between married people. While similar to a divorce in that the court can issue rulings regarding money and children, the parties are still legally married following the process. It is usually done for religious reasons, when people cannot live together but divorce is not an option.
However, a legal separation can also be sought when married parties wish to start living separately and seek a full divorce down the road. Please note that if one party requested a legal separation and the other seeks a divorce, the court will grant the divorce.
Call Fairfield Family Law if you have any questions at all about the legal separation process.