Instagram defines sensitive content as "posts that don't necessarily breach our guidelines, but may be distressing to certain people."
- Content that may depict violence - Content that may be sexually explicit - Content that promotes the use of certain regulated products or depict cosmetic procedures - Etc.
Sensitive Content Control is the latest option Instagram gives to let users customise their experience.
- From your profile, click "Settings. - Tap "Account" then "Sensitive Content Control" - Choose a content level. -"Confirm"