Hello dear, Divorce, also known as dissolution of marriage, is the termination of a marriage or marital union, 
My parents divorced when I was a child. How does the process work?
Divorce laws vary considerably around the world, but in most countries divorce requires the sanction of a court or other authority in a legal process
Are divorces common throughout the world?
Yes it is, divorce process may involve issues of alimony (spousal support), child custody, child visitation / access, parenting time, child support, distribution of property, and division of debt.
It sounds like a very complicated and thorough process. How expensive can this process be?
Depends on the legal practitioner.  In most countries, monogamy is required by law, so divorce allows each former partner to marry another person