Items and documents can be deleted by users who have the Contribute permissions of above so SharePoint gives us the option of a recycle bin. This can be found in any site by following these quick steps.
- As a Contributor or above for the site go to your 'Site Contents'.
- This will display all the information for your site including on the right hand side a link to the 'Recycle bin'
- Click to go in to the Recycle bin and you will see a list of the contents that have been deleted. It is worth noting 'Contributors' or 'Editors' will only see the items they have deleted while Site Administrators will see all items deleted. Either user can restore items at this point depending on what they can see.
- Pick the item you want to restore and this will display a restore button at the top. Also note the delete button can appear in some scenarios allowing for the items to be completed removed from a site.
The Recycle Bin holds deleted items for 93 days from the date of deletion and can be accessed at any time in that time frame. If items are deleted from the Recycle Bin they are stored in a secondary Recycle Bin only accessible by Site Administrators but are not stored for any longer than 93 days.
More details can be found in the Microsoft Documentation.