What causes the shadows on the corner?

What causes the shadows on the corner? Hi guys. New to photography. Got a canon r10 with RF-S18-45mm f/4.5-6.3 IS STM lens. I realise I get the shadows on the corners occasionally and I do not know why. Any advice is greatly appreciated. Thank you! Example: https://imgur.com/a/h2HZHTj
submitted by /u/meningococo123

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