Like PCR, but does not require thermal cycling. Thus the "isothermal" in the name: iso means same, so "same temperature".
Not needing the thermo cycling means that the equipment needed is much smaller and cheaper it seems.
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Loop-mediated isothermal amplification (LAMP) is a nucleic acid amplification method used to rapidly and efficiently amplify specific DNA or RNA sequences. It is characterized by its simplicity and ability to operate at a constant temperature, typically between 60°C and 65°C, without the need for thermal cycling, which is required in traditional polymerase chain reaction (PCR) methods.