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I am doing the cryptozombies.io course on Solidity.

In Chapter 7 of Making the Zombie Factory, it introduces function declarations. The instructions on this chapter are:

Create a public function named createZombie. It should take two parameters: _name (a string), and _dna (a uint). Don't forget to pass the first argument by value by using the memory keyword

My question is why is the _name parameter required to be declared with keyword memory (and similarly, why is the _dna parameter NOT required to be declared with keyword memory)?

In general, when does one declare a parameter using keyword memory and without it? I did Google about the memory keyword but I did not understand when it should be used and when it shouldn't.

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