certain ads flash on this app all time for admission in the universities like Chandigarh University, Galgotias University, etc. I want to know what type of universities are these? They claim to give the placement of high salaries. What is truth behind all this. When should we towards their offer.?

The possible reason to pop up those advertisement may be you have search about Chandigarh university because many students are taking admission this university for quality education and placements in top MNC. There could be other reason you may see many add flash about chandigah university as you may search about top universities in India in your search engine. As Chandigarh become emerging university in north India for past few years they wont shy to pops up as ads flash.

About placement I have no idea about Galgotia University , But Chandigarh university provide excellent placement in top MNC such as Microsoft, Amazon, Walt Disney, IBM, Flipkart, SAP Labs are visiting CU Campus for recruitment of fresh talent. As a result, Chandigarh University has been awarded with the title "University with Best Placements" in India. With more than 691 Multi-Nationals visiting CU Campus in 2019-20, the number of offers have touched 6617 and the highest package has registered a growth of 30% & have scaled to a new high of 35 LPA. There have been more than 60 MNC's which have recruited Engineering students from Chandigarh University, IITs and NIT's where there have been 40+ MNC's who have commonly recruited fresh talent from University School of Business at Chandigarh University and IIMs. Apart from it, some of the leading multinationals which regularly recruit CU students include Microsoft, Amazon, IBM, Hewlett Packard, SAP Labs, Hitachi, Deloitte, Ernst & Young, Grail Research, TAFE, John Deere, Schindler, Deepak Nitrate, Mindtree, The Taj, Oberoi, Hyatt, Vistara and Jet Airways.