Python: Difference between Change and Update in Dictionaries

What is the actual difference between Change and Update function in Dictionaries?

suppose we have dictionaries

dictt={

name:"Minkon",

age:34,

address:"Guwahati"

}

Now if we want to change the address to Bangalore, the syntax will be

dictt["address"]="Bangalore"

now print(dictt) will show the changed value of address as Bangalore

Now instead of using change method, if we use the update method, the value will change whatever the argument we pass through it. As like

dictt.update({"address":"Bangalore"})

and now print(dictt) will aslo give the same result as we suppose to get in change method.

Explanation is highly appreciable in terms of the difference between these two methods.