Amazon allows free inbound data transfer, but charges for outbound data transfer. I don't understand what that exactly means. Does this means that data you upload to amazon is free, but data you download is not? This question may be silly but I want to know what you guys think about this.
No cost for Inbound Data Transfers (i.e. data transfer into Azure Data Centers). Outbound Data Transfer — This is either data flowing from Azure Data Centers out to internet or from one Azure Region to another.
“Outbound Transfer” means an electronic transfer of funds from your account at United Federal Credit Union to an External Account. “Pay From Account” means the account from which funds will be sent. “Pay To Account” means the account to which funds will be transferred.
Data "inbound" to Amazon (that is, packet data that is destined for the Amazon cloud servers; for example, uploads and client requests) are free. Data "outbound" from Amazon is billed (that is, downloads from the cloud and responses to client requests).
Inbound traffic originates from outside the network, while outbound traffic originates inside the network. Sometimes, a dedicated firewall appliance or an off-site cloud service, such as a secure web gateway, is used for outbound traffic because of the specialized filtering technologies necessary.
You have it correct. Data "inbound" to Amazon (that is, packet data that is destined for the Amazon cloud servers; for example, uploads and client requests) are free. Data "outbound" from Amazon is billed (that is, downloads from the cloud and responses to client requests).
Anyway, here is a picture that may help you visualize this
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