What is considered stock manipulation?

I read this news of stock manipulative in Biocon shares.

I want to know what exactly consider as stock manipulation ?

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In this specific case, the SEBI order explains in detail (including trade logs, etc) how stock manipulation was done. In summary, the main allegations are as follows (Page 6 of the SEBI Order) -

k) It is alleged that all the 6 Noticees had engaged in price manipulation in the scrip of Biocon Ltd. at NSE cash market during 15:00:00 hrs to 15:30:00 hrs on June 29, 2017 and managed to establish higher settlement price in the futures of Biocon Ltd. on June 29, 2017, which finally closed at Rs. 332.15. Further, the Noticees heavily traded in the scrip and created volume at higher prices during last half an hour on June 29, 2017 to get a better future settlement price.

l) It is alleged that the aforesaid scheme of “marking the close” devised by the six Noticees enabled four of them who had taken long positions in the Biocon Ltd. futures during 15:00:00 hrs to 15:30:00 hrs on June 29, 2017 to increase their profit arising out of their long positions