Organic reports focus on only organic traffic from search engines and will be particularly useful for SEO reporting, there are 4 reports available in the Organic Traffic Section:
The Organic Overview reports show you the high level information about your website's organic traffic over time.
Organic Search Engines
Organic Search Engines report don't only show you your organic traffic but also grouped them by each search engines, you can visualize these data with a trend chart or a pie chart.
Organic Landing Pages
Organic Landing Pages report shows you all the organic traffic data grouped by landing pages, you can visualize your landing page traffic with the pie chart to see the distribution of landing page traffic across your site. This report is also designed to be a solution of "not provided" keywords, by combining ranking data with search volume and traffic data, you will be able to get a sense of what your (not provided) keywords are, learn more about Organic Landing Pages report.
Organic Keywords report group all your organic traffic by keywords, you will be able to see which keywords from what search engines have drove traffic to your website, however with search engines restricting organic keyword data since 2011 (The "not provided" phenomenon), over 90% of organic keywords will not be visible here.