How does the interaction between trample and deathtouch work in a game of Magic: The Gathering?

When a creature with trample and deathtouch attacks or blocks in Magic: The Gathering, it only needs to assign 1 damage to each blocker before assigning excess damage to the defending player or planeswalker. The deathtouch ability means that any amount of damage dealt by the creature is enough to destroy another creature, making it easier for the trample damage to go through to the player or planeswalker.