There are a number of previous reviews on general techniques used
for dark matter searches [105,
119,
131]. Two basic methods can be used, either direct or indirect.
Direct searches depend on dark matter particles actually passing
through detectors and physically interacting with them. Indirect
searches look for secondary products produced when dark matter
particles annihilate each other elsewhere. Direct searches can,
in principle, be used to look for neutrinos, axions and WIMPs,
whereas only WIMPs are accessible indirectly.