The trigger system which selects the collision events in real-time at the LHC for subsequent detailed off-line analysis, plays a crucial role in determining the physics capabilities of the concerned experiment. This talk will have two parts. The first part will discuss the plans for the software-based high level trigger (HLT) for the CMS experiment at the high luminosity LHC (HL-LHC) phase. It is marked by the increase in the instantaneous luminosity; consequently, the pile-up will raise the event rate to a level which is extremely challenging for the trigger algorithms. We shall discuss the recent development of the HLT criteria, based on electrons and photons at the HLLHC. The second part of the talk will cover the development of novel technique of data scouting implemented during the past Run2 operation. After several years of operation of the LHC, new physics beyond the standard model has not yet been found. Therefore one of the best hopes for discovering it is to explore the difficult-to-access corners of the event phase space, such as the low mass regions where data collection is challenging. Data scouting or trigger-level analysis is one such way to extend the scope of searches for new physics. The special methodology of dataflow, which employs the event-size reduction to increase the rate of event acceptance, will be presented.
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