In most Western countries, a divorce does not declare a marriage null and void, as in an annulment, but it does cancel the married status of the parties. Where monogamy is law, this allows each former partner to marry another. Where polygyny is legal, divorce allows the woman to marry another. Divorce laws vary considerably around the world. Divorce is not permitted in some countries, such as in Malta and in the Philippines, though an annulment is permitted. From 1971 to 1996, four European countries legalised divorce: Spain, Italy, Portugal and the Republic of Ireland.

In some Western jurisdictions, divorce does not require a party to claim fault of their partner that leads to the breakdown of marriage. But even in jurisdictions which have adopted the "no fault" principle in divorce proceedings, a court may still take into account the behaviour of the parties when dividing property, debts, evaluating custody, and support; facts which almost always have considerable weight in fault proceedings.[citation needed]

In most jurisdictions, a divorce must be certified by a court of law to become effective. The terms of the divorce are usually determined by the court, though they may take into account prenuptial agreements or postnuptial agreements, or simply ratify terms that the spouses may have agreed to privately. In the absence of agreement, a contested divorce may be stressful to the spouses and lead to expensive litigation. Less adversarial approaches to divorce settlements have recently emerged, such as mediation and collaborative divorce, which negotiate mutually acceptable resolution to conflicts. In some other countries, when the spouses agree to divorce and to the terms of the divorce, it can be certified by a non-judiciary administrative entity. In Portugal, this option has been available by "electronic divorce" since March 2008. The effect of a divorce is that both parties are free to marry again (in contrast to bigamy).[citation needed]

The subject of divorce as a social phenomenon is an important research topic in sociology. In many developed countries, divorce rates increased markedly during the twentieth century. Among the nations in which divorce has become commonplace are the United States, the United Kingdom, Canada, Germany, Australia and Scandinavia. Japan and Italy retain a lower divorce rate, and it has decreased recently.[when?][citation needed]

Though divorce laws vary between jurisdiction, there are two basic approaches to divorce: fault based and no-fault based. However, even in some jurisdictions that do not require a party to claim fault of their partner, a court may still take into account the behaviour of the parties when dividing property, debts, evaluating custody, and support.

Laws vary as to the waiting period before a divorce is effective. Also, residency requirements vary. However, issues of division of property are typically determined by the law of the jurisdiction in which the property is located.[citation needed]

Under a no-fault divorce system, the dissolution of a marriage does not require an allegation or proof of fault of either party.

The application can be made by either party or by both parties jointly.[where?]

Prior to 1975, countries which permitted divorces also required proof by one party that the other party had committed an act incompatible to the marriage. This was termed "grounds" for divorce (popularly called "fault") and was the only way to terminate a marriage. Most jurisdictions around the world still require such proof of fault. In the United States, no-fault divorce is now available in all 50 states and the District of Columbia--New York, the last state to still require fault-based divorce, passed a bill in 2010 permitting no-fault divorce.[citation needed]

Fault-based divorces can be contested; evaluation of offenses may involve allegations of collusion of the parties (working together to get the divorce), or condonation (approving the offense), connivance (tricking someone into committing an offense), or provocation by the other party. Contested fault divorces can be expensive, and not usually practical as eventually most divorces are granted. Comparative rectitude is a doctrine used to determine which spouse is more at fault when both spouses are guilty of breaches.[citation needed]