What does deathtouch do in Magic: The Gathering and how does it impact gameplay?

In Magic: The Gathering, deathtouch is an ability that allows a creature to destroy any creature it deals damage to, regardless of the amount of damage dealt. This impacts gameplay by making creatures with deathtouch very powerful in combat, as opponents must think twice before blocking or attacking with their creatures. It can also influence strategic decisions, as players may need to find ways to deal with deathtouch creatures to avoid losing their own valuable creatures in combat.