This way, others will be able to see that chart if you decide to copy and share the link/URL.
Checking the "Shareable" option for a chart: If you want to share the link/URL to a chart's report with a friend, you can opt to make a chart shareable. This way, others will be able to see that chart if you decide to copy and share the link/URL. Otherwise, you can leave the Shareable box unchecked (default) so that only you can view the chart. If you change your mind later, you can choose to Edit the chart and make it shareable, effectively making it viewable by others.