The Search Engine Results Page (or SERP) is where Google displays the results for a search query. These results are short web page summaries, known as SERP Snippets.
The top three positions in the SERPs get over 70% of all the clicks. And this means that the SERPs are fiercely contested territory.
One of the factors that will determine where your page ranks in the SERPs is click-through rate. If your SERP snippet gets a higher click-through rate than the page listed above you, the algorithm will eventually move your page up one position and the other page down.
There are lots of other factors that affect your position in the SERPs, mostly to do with the user experience (UX) of your visitors after they land on your page.
Here are some articles to help you understand how the SERPs work and how you can optimize your page to rank higher in the SERPs: