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​Hi Rajat,

Qsys/Platform Designer is a system integration tool, We can use already build and tested IP's from IP catalog or design our own IP's from scratch. By using those IP's and integrating them we can develop a complex system using Qsys.

Simply used for integration of IP's.

For example

1. lets say we want to control an led using a dip switch. Which can be written in simple HDL(VHDL/VERILOG) code. Another way to implement is by using IP's(PIO from Qsys catalog).
2. Complex design will have many interfaces (storage and communication interface) which requires controllers(And which is provided by the IP from catalog) for communication between them and user logic. Which may include many IP's.

If we integrate in with HDL we may face many integration issues which can be eliminated by QSYS/Platform Designer.

kindly refer below links.

https://www.intel.com/content/www/us/en/programmable/products/design-software/fpga-design/quartus-prime/features/qts-platform-designer.html

https://www.intel.com/content/www/us/en/programmable/support/training/course/oqsys1000.html

https://www.intel.com/content/www/us/en/programmable/support/support-resources/design-examples/design-software/qsys/exm-qsys-tut.html

Regards

Anand