Can multiple devices connect on single USB bus?

I thought only one peripheral can connect to PC with single USB interface?  A document on the internet says maximum number of 127 devices can be on the USB interface?

How is this possible?  I have seen either a printer, or keyboard, or mouse, etc. connect to a usb port on PC.  But I have never seen multiple devices connected to PC on a single USB port.

Please clarify!
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naseeamAsked:
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ChrisConnect With a Mentor Commented:
USB Hub. This may be a dedicated hub put in by the user or may be integrated into a device such as a keyboard or printer etc.
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akhalighiConnect With a Mentor Commented:
That's a bit dangerous ; I wouldn't . USB devices usually get their power from USB as well , connecting many to one USB controller would be risky . use a USB hub that has an external power adapter . that's more safe.
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naseeamAuthor Commented:
Thank you!
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