When someone visits your site or completes an action that is known as a conversion. In Google Analytics a conversion is typically credited to the last action that took place.
For example when someone does a Search for your company, or another website Refers to your website, or an Ad was clicked on, those last interactions get the credit for the conversion.
The power of Google Analytics comes in its ability to provide insight into many different avenues. From high-level information such as the total monthly sessions, to detailed data like the number of clicks a specific element on the page received between Monday and Wednesday of last week, Google Analytics can do it all.
Since the standard Google Analytics platform is offered at no cost, Google only offers so much processing power and limits the amount of data that is allowed for each view in a Google Analytics account. If your website has a large amount of sessions, you may notice a yellow box at the top right of the report stating that “this reports is based off of x% of total sessions.”