If you do NOT have check-in baggage that needs to be transferred, you can just go through the Transit hall. If you do have check-in baggage then you should check with the airline whether the bags will be transferred directly. If they will not do so, then you will need to clear Immigrations to collect your bags, for which a visa is required.
There have been instances at Delhi airport of some airline staff helping transit passengers without a visa to collect their bags, but this is not a regular feature. So check with the airline and plan accordingly.
Good advise by MG10101
I also did a quick check on Transit visa rules and found this link , depending upon the time you have before you travel you may want to explore this option as well just to be on the safe side if your airline does not forward the bags to the next airline .
The link is 4 year old ( maybe other members might be able to guide you more on transit visa option)
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