How can I determine whether the server is a virtual machine or a physical real machine?

How can I determine whether the server is a virtual machine or a physical real machine?
Dmidecode | grep-A20 "Memory Device $" | sed-n-e '/Locator/p'-e'/Size/P' | grep-v "Bank Locator"
View Memory Distribution
[Real machine] # dmidecode | grep-A20 "Memory Device $" | sed-n-e '/Locator/p'-e'/Size/P' | grep-v" bank Locator"
Size: 4096 MB
Locator: DIMM0
Size: 4096 MB
Locator: DIMM1
Size: 4096 MB
Locator: DIMM2
Size: 4096 MB
Locator: DIMM3


[Virtual Machine] # dmidecode | grep-A20 "Memory Device $" | sed-n-e '/Locator/p'-e'/Size/P' | grep-v "Bank locator"
Size: 1024 MB
Locator: RAM slot #0
Size: 512 MB
Locator: RAM slot #1
Size: 256 MB
Locator: RAM slot #2
Size: 128 MB
Locator: RAM slot #3
Size: 64 MB
Locator: RAM slot #4
Size: 16 MB
Locator: RAM slot #5
Size: No Module Installed
Locator: RAM slot #6
Size: No Module Installed
Locator: RAM slot #7
Size: No Module Installed
Locator: RAM slot #8
Size: No Module Installed
Locator: RAM slot #9
Size: No Module Installed
Locator: RAM slot #10
Size: No Module Installed
Locator: RAM slot #11
Size: No Module Installed
Locator: RAM slot #12
Size: No Module Installed
Locator: RAM slot #13
Size: No Module Installed
Locator: RAM slot #14

------- Uneven Memory Distribution

--- Directly view the product name
Dmidecode | grep "Product"


[Root @ lixora ~] # Dmidecode | grep "Product"
Product Name: VMware Virtual Platform
Product Name: paibx Desktop Reference Platform


[Root @ oracle sysbench-0.4.12] # dmidecode | grep "Product"
Product Name: System Product Name
Product Name: P8Z68-V LX


------ Observe the hardware device. If you see that the character similar to VMware is basically a virtual machine

[Virtual Machine] lspci-B | grep VMware
00:07. 7 System peripheral: VMware Virtual Machine Communication Interface (rev 10)
00: 0f. 0 VGA compatible controller: VMware svga ii Adapter
00:11. 0 PCI bridge: VMware PCI bridge (rev 02)
00:15. 0 PCI bridge: VMware PCI Express Root Port (rev 01)
00:15. 1 PCI bridge: VMware PCI Express Root Port (rev 01)
. 2 PCI bridge: VMware PCI Express Root Port (rev 01)
. 3 PCI bridge: VMware PCI Express Root Port (rev 01)

00:15. 4 PCI bridge: VMware PCI Express Root Port (rev 01)