I read these 2 doc pages: summary and summary-card-with-large-image, but I don't really see the difference.
Example:
<meta name="twitter:card" content="summary" /> <!-- or summary_large_image -->
<meta name="twitter:title" content="Small Island Developing States Photo Submission" />
<meta name="twitter:image" content="https://farm6.staticflickr.com/5510/14338202952_93595258ff_z.jpg" />
What is the actual difference betwen both at the end? The rendering looks identical: