The number of USB ports on a motherboard varies widely depending on the model and manufacturer. Typical modern motherboards can have:

• Around 4 to 8 USB 2.0 ports, often split between rear panel and internal headers.
• 2 to 4 USB 3.x ports (including USB 3.0, 3.1, or 3.2), sometimes including USB-C ports.
• Some high-end boards may have multiple USB 3.x host controllers supporting many USB 3.x ports.

For example, a Gigabyte B450M-DS3H motherboard has:

• 4 USB 2.0 ports (4 on back panel or internal headers)
• 2 USB 3.1 Gen 1 ports (including options for USB-C)
  This board supports 2 front panel USB 3 ports and 4 USB 2.0 ports through internal headers

Motherboards usually have USB ports both on the rear I/O panel and via internal headers that can connect to front panel USB ports on the case. Each internal USB header typically supports 2 USB ports

. To find out exactly how many USB ports your specific motherboard has, check the manufacturer's website or the motherboard's manual under specifications. It will list the number and type of USB ports available on the rear panel and internal headers

. In summary:

• Check your motherboard model specifications for exact USB port count.
• Typical mid-range boards have 6-10 USB ports combining USB 2.0 and USB 3.x.
• Internal headers allow connecting additional ports on the PC case front panel.
• USB ports on a motherboard are a mix of rear panel ports and internal headers.

If you provide your motherboard model, I can help find the exact number of USB ports it supports.