Name: API Essentials - 06 API vs. SDK（API vs. SDK: What's the difference?）
Uploaded: 2022-05-11T02:24:47.000Z
Duration: 9 min 21 s
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How can APIs and SDKs help streamline my cloud app development workflows?

and before I jump in and answer that for you,

Alright, let's get started with an example.

Let's say you're developing a mobile app for a veterinarian clinic,

and the idea is for this mobile app to actually

allow a receptionist to take a picture of a pet as it enters the clinic

and the app will communicate with a visual recognition service

And the idea is for the service to return the pet's name and bring up their file.  

So, how do we do this? How do we communicate  between the mobile app and this cloud-based  service?

Well, that's where APIs and SDKs come in.

So, first of all, APIs are all about communication.

So, there are a set of definitions and protocols

for apps or services to talk to other apps or services.

So, you can kind of think of them like a bridge between your app

and, say, this cloud-based visual recognition service.

Well, it's Application Programming interface - A.P.I.

And what are some of the aspects of APIs that make them useful?

Well, like I said they're they're all about communication.

So, communicating between a service and another service, an app and another app,

So, inside the VR service, up in the cloud,

there's probably potentially thousands of lines of code running up there,  right?

And you as a developer of a mobile app you don't want to have to worry about,

"OK, which method in this service do I call to get the pet's name?"

You don't want to have to worry about that.

So, what an API does is it abstracts away all that complicated logic

so you just have to worry about getting just the  data you need.

Meaning, there's industry-defined standards  for how to define an API

and there's a few formats that are popular for APIs.

You may have heard of SOAP, GraphQL, or REST,

- which, fun fact, stands for "Representational State  Transfer",

and that's what we'll focus on for this video.

So, what are some of the building blocks of APIs?

First of all, to actually send data, or send what's called a "request"

from the mobile app to the VR service on the cloud

So, for a REST API call request you need to have

So this is this could be HTTP methods like POST, PUT, GET, DELETE.

because you're sending a request over to the service

which might include something like maybe the file name

Next, would be parameters, this is optional.

So, this, in this case, might be the file name of the image you took.

So maybe cat.jpeg - if it's a cat that you took a picture of.

of the visual recognition service that you're trying to talk to.

So, maybe that's, you know, it's some URL-slash-analyze.

What might a REST API response call that you receive back

from the visual recognition service look like?

Typically it's it's some form of raw data, maybe JSON.  

or sorry, a RESPONSE, might look something like this.

So, you have sort of this this data object that might include

you know, the result, the type which is a cat,

which, in this case may be "Mittens" just walked into the  clinic.

Great, so that's sort of the building blocks of what an API is.

As a developer though, how do you actually call an API in your code?

setting up your request with all these building blocks of operations, parameters, endpoints,

and dealing with raw JSON objects, right?

So that's where SDKs come in and really shine.

So, let's talk about SDKs, what does that stand for?

Well it is Software Development Kit, S.D.K.

So, SDKs, you can really think of like a toolbox

of tools, or code that actually call APIs for you.

So, you may be specialized in one programming language over the other,  

you know, there's SDKs in a variety of languages.

So, there's maybe an SDK in Java, in Node,

whichever language that is your specialty there's probably an SDK for you.

Perfect. So, back to our example over here,

what might an SDK look like in this example?

So, with an SDK, let's let's go ahead and put our little SDK toolbox

and, for this case, since it's a mobile app,

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API Essentials - 06 API vs. SDK（API vs. SDK: What's the difference?）

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