Inside Yandex, Direct has many tools, but not all of them are useful.
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DRF — what is it?
Additional relevant phrases that Yandex automatically selects.
If you have enabled this feature, the system will automatically select new keywords.
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Additional relevant phrases work only on search, and do not work in the Yandex Advertising Network.
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Turn it on or not?
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In most cases, the DRF does not work well and drains the budget, but it is still better to test whether the DRF will work well in your case.
For testing, you should set a small budget from the total campaign budget, for example, 5-10%.
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Important.
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The more budget we specify from the overall campaign budget, the more Yandex will add junk keywords.
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For example, if we specify 50% of the total campaign budget, Yandex shoves us all the garbage. If we specify 5-10%, Yandex selects more targeted keywords.