Marriage for centuries has been the keystone of numerous philosophical debates.
So, what is marriage?
There can be two different points of view: scientific and human.
Scientific.
"Marriage is a social union or legal contract between people that creates kinship. It's an institution in which interpersonal relationships, usually intimate and sexual, are acknowledged in a variety of ways, deneding on culture or subculture in which it is found. Such a union, often formalized via a wedding ceremony, may also be called matrimony"
-en.wikipedia org.
And what about human point of view?
You won't find one and the same definition between ordinary people. For every exact person word "mariage" has different meaning. So I will stick to mine point of view.
As for me, marriage is a lifelong burden. It's myphological creature Maybe in the beggining of the existance it wasa real thing, but now it has no value. I mean spiritual value. Nowadays marriage is a cocktail. Please, remember the recipe: 1/2 of economical relationships, 1/2 of the social status and opportunity to boast around. Oh, and do not forget a pinch of juridicial duties.
So, I think that marriage nowadays is a burden. I don't think that in the beggining the idea was SO awful, but through the centuries marriage has devalued. Due to the people of course and their behavior.
As to my mind woman and man can love each other, cary about each other, have children and just be happy without this stupid stamp. Inside they are already married.
They are devoted to each other and these two do not need material confirmation of this fact. And even more: they don't care what other people would say.
And that is great. That is the REAL thing.