Suppose there are many computers connected within a Network.
Let's take 2 examples. Computer A and Computer B, connected within the same network.
Suppose, At the start of the day, say myself as an user using computer B.
I download and upload many things on the internet and my personal details through Ethernet network using computer B.
At the end of the day, can the computer A connected within the same network as computer B, can access the information that I have uploaded/downloaded to/from the internet through the Ethernet network connected as we all are in the same network?
If its not possible, who can monitor or have access to the information that I have uploaded/downloaded to/from internet within the same network?
Is it possible in WiFi network too?
Please help to clarify my doubt in simple terms with less technical jargon, as I am a Newbie.