syntax - Defining methods with equals in Ruby

Being new to Ruby, I'm having trouble explaining to myself the behavior around method definitions within Ruby.

The example is noted below...

class Foo
  def do_something(action)
  def do_something_else=action 

?> f.do_something("drive")
=> "\"drive\""

?> f.do_something_else=("drive")
=> "drive"

The first example is self explanatory. What Im trying to understand is the behavior of the second example. Other than what looks to be one producing a string literal and the other is not, what is actually happening? Why would I use one over the other?

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