English is not my first language can someone help me understand a post?

What is a common law marriage I just read a post about that and I have no clue what that means?

    Hi! That was probably my post (just posted it). It is all the trappings of marriage without the legal/religious official aspect. Living together, financially linked (same accounts), living as a married couple, most people consider us married even thought we technically are not. Basically we are husband and wife in our actions but not in name or legality. Does that explain it? :)
    About Anastasiya Belov
    Birth: July 14
    On Moms.com since: Feb 24, 2014
    I am stay at home mother who just recently moved to the US from the Russia. I came here to go school and met my husband. After that we planned a marriage and I moved here in 2009. We have 2 small children and I am a stay at home mom but I do work from home