接口通常指的是日常生活中用到的接口，主要是指物品上的外接接口，以手机充电口举例，有Micro USB接口、type-c接口，还有Lightning接口（ios设备），这三个接口就是一个接口定义，规定了这个充电口的形状、大小。这就是接口。
API是Application Program Interface的缩写，叫做应用程序接口，是一组定义、程序及协议的集合，主要功能是提供通用功能集，实现计算机软件之间的相互通信。我们通过API接口可以实现特定的功能，而不需要了解其内部实现细节。可以把API接口理解为是特定服务的一种封装，将服务封装起来提供给他人调用，这样一来很多功能不需要从新开发。
比如，我们想要知道一周天气如何，如果由自己来实现这个功能很难，因为天气数据只有气象部门才知道。那该如何知道天气信息呢？气象部门提供数据API给我们使用，我们只要输入地区就会知道该地区一周的天气情况，但我们并不需要了解这天气预报是如何实现的。API调取数据也是同样的道理。
以淘宝关键字接口为例：
通过关键字就可以搜索到你想要的数据，下面是测试代码显示结果：
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"seller_id": "2209090117041", "detail_url": "item.taobao.com/item.htm?id…", "data_f": null, "data_update": "2021-10-16 12:58:46" }, { "title": "【返场可用券】女装 乔其纱荷叶边领衬衫(优衣库云朵衫)429418", "pic_url": "img.alicdn.com/imgextra/i1…", "promotion_price": "99.00", "price": "99.00", "sales": 0, "num_iid": "630637243596", "seller_nick": "优衣库官方旗舰店", "seller_id": "0", "detail_url": "item.taobao.com/item.htm?id…", "data_f": "ez", "data_update": "2021-10-26 01:29:59" }, { "title": "女装 法兰绒松紧长裤 419869 优衣库UNIQLO", "pic_url": "img.alicdn.com/imgextra/i1…", "promotion_price": "79.00", "price": "79.00", "sales": 0, "num_iid": "603915062201", "seller_nick": "优衣库官方旗舰店", "seller_id": "0", "detail_url": "item.taobao.com/item.htm?id…", "data_f": null, "data_update": "2021-10-17 03:34:41" }, { "title": "优衣库 女装/情侣装 便携式防紫外线连帽外套(防晒衣) 419912", "pic_url": "img.alicdn.com/imgextra/i1…", "promotion_price": "99.00", "price": "99.00", "sales": 0, "num_iid": "594452029554", "seller_nick": "优衣库官方旗舰店", "seller_id": "0", 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注册可以赠送测试，亲测有效：获取Key和secret
