50 MB and 50 Mb are commonly confused, but these are two different measurements. MB (megabytes) is used to measure data usage and caps in an internet plan, while a Mb (megabit) is 1/8th the size of a megabyte and is used to measure speed per second.  50 MB of data is an incredibly small amount of data in your internet plan. For context, you use about 1GB (1000 MB) of data per hour of streaming. Conversely, 50 Mbps (megabits per second) of internet speed is relatively fast and could download that 1 GB of data in under 3 minutes.