SERP - Search Engine Results Page aka SER – Search Engine Result is a result to a keyword query you do on a search engine. On a SERP you can see organic results, and paid results. If you want to be on top three in organic results, you need to perform SEO. If you want to be in the paid results, you need to create an Adwords campaign.
When nobody competes for a keyword it’s easy to be first both in organic and paid results, but when competition is big… Well you just have to do better SEO, and have bigger wallets. This is a very simple term, nothing much to say here.
