According to XDA,Odin mode (or Download mode) is for Samsung Galaxy phones what the name means — you are a God. In Odin mode, the user is able to flash whatever wants to the internal flash memory inside the phone by connecting phone to the computer via USB cable. As Odin mode is simple program (in the phone), poor user may not even flash main (Android) system, kernel, recovery system, but this is possible to repartition internal flash and reflash Odin mode itself. If something goes wrong and the Odin mode is broken (erased, rewritten, corrupted), the phone no longer boots and is hard-bricked. So Odin mode is dangerous. Because of this dangerous nature of Odin mode, Odin mode is usually used to only reflash main system or recovery (see warnings below) and if possible, recovery mode is used for flashing (as it is less dangerous).
How To Reboot Into Odin Mode/Download Mode ?
On most Android devices we need to get into the Bootloader/Fastboot mode to flash factory images or firmwares. Samsung Galaxy devices feature a Download Mode that prepares your device to receive data from your computer via a dedicated flashing tool called Odin. Here’s how you can boot your Samsung phone or tablet into the Download Mode. Turn off your device and then press and hold Volume UP + Home + Power buttons simultaneously for 2-3 seconds.
When you see the warning screen with a yellow triangle sign, press the Volume Up key to enter Download Mode/Odin mode
After pressing the Volume Up key, you device will get into the Odin mode and it simply means that you can proceed with installing your firmware, CF-Auto-Root or CWM/TWRP recovery file. Here is how Download mode screen on Samsung devices looks like the picture below
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