Bandwidth
How much data per second passes through a network link. Measured in Mbps or Gbps.
Not the same as latency: bandwidth is "how wide the pipe is" (how much at once), latency is "how long the pipe is" (how fast a single byte gets across).
A 100 Mbps connection can theoretically push 12 MB/sec. In practice: subtract overhead, TCP windowing, and competing traffic.