Traffic refers to the amount of data exchanged between the server and the client.
This occurs when downloading a file or viewing the contents of the homepage at the request of a client.
All text as well as image files on the homepage are included in the data transfer amount.
This is caused by the number of visitors to your website using a lot of network traffic.
If it decreases, traffic will also decrease, but depending on the capacity of images etc. on the homepage, traffic will decrease.
The connection volume may be high at least.