到底什么是“第三方”？ （第一方和第二方分别是谁？）
我确切地知道“第三方库”是什么，所以我认为这种情况下的“第三方”只是开发人员以外的任意个人或公司？
它与“第一人称”、“第二人称”和“第三人称”语法观点有关吗？
存在“第三方”的事实表明也存在“第一方”和“第二方”。这些术语定义明确吗？
（我的母语不是英语。）
I know precisely what a "third-party library" is, so I assume that the "third-party" in this case simply is an arbitrary person or company other than the developer?
Does it have to do with "first person", "second person", and "third person" grammatical points of view?
The fact that there is a "third party" suggests that there is a "first party" and a "second party" as well. Are those terms well defined?
(I'm not a native english speaker.)
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如果您正在为客户开发软件，那么您/您的公司与客户/他们的公司之间就会签订合同。这是合同的两个当事人。不受合同约束的任何其他人都是第三方。只要两方之间存在合同，就可以使用它来表示不受合同约束的任何人。
双方谁是第一、谁是第二并没有固定的含义，通常你会认为你是第一方，客户是第二方，而客户会认为他们是第一方，你是第一方。第二人称，与第一人称（我、我们）、第二人称（你）和第三人称（他、她、它、他们）类似。
If you are developing software for a client, then there is a contract between you/your company, and the client/their company. These are the two parties to the contract. Anyone else, not bound by the contract, is a third party. It's used wherever a contract exists between two parties to mean anyone not bound by the contract.
There is no fixed meaning to which of the two parties is 'first' and which 'second', usually you will think you're the first party, and the client the second, whereas the client will think they are the first party and you the second, in a similar fashion to first (I, we), second (you), and third person (he, she, it, they).
当谈论语法（英语语法或其他语言的语法）时，这些术语在英语中有很好的定义。
第一人称对应于
代词“我”和“我们”； “我”和“我们”（因此，以第一人称写的书是由中心人物讲述的故事 - “我做了这个”，而不是“史密斯做了这个”）。
第二人称对应
代词“你”。
第三人称
对应代词“他”，
“她”、“它”和“他们”； “他”、“她”
和“他们”。
所以“第三方”指的不是你或我，而是他们。
These terms are well defined in English when talking about grammar (English grammar or another language's).
First person corresponds to the
pronouns "I" and "we"; "me" and "us" (so a book written in the first person is a story told by the central character - "I did this" as opposed to "Smith did this").
Second person corresponds to the
pronoun "you".
Third person
corresponds to the pronouns" he",
"she", "it" and "they"; "him", "her"
and "them".
So "third party" just means not you or me, but them.
第一方 = 我
第二方 = 你
第三方 = 他/她（即对话之外的人）
1st party = I
2nd party = you
3rd party = he/she (i.e. someone external to the conversation)
我们以 iPhone 为例。
苹果的硬件和软件都是第一方。
像我这样的最终用户和你是第二方。
第三方是像应用程序开发人员一样进入这种关系的人
这影响了我和苹果。
注意：第一方和第二方可以互换。
Let's take Iphone for example.
Apple by its hardware and software are first party.
End user like me and you are the second party .
the third party is the person who enter this relation like an app developer
that effect me and apple .
Note: the first and second party can be swapped .
由除本人以外的其他人
开发商。 PDFSharp 将是
被视为第 3 方。
by someone else other than the
developers. PDFSharp will be
considered 3rd party.
我不认为第一方和第二方在编程中使用得太多（如果有的话）。如果有人开始谈论工作中的第一方和第二方，我会想知道它们是什么意思。然而，“第三方”更为常见和熟悉。
“第三方软件”是一个常见术语。我从未听说过“第一方软件”或“第二方软件”。
PS：我在英国以英语为母语。
I don't think first and second party are used that much, if at all, in programming. If someone started talking about first and second parties at work, I would wonder what they meant. However, "third party" is much more common and familiar.
"Third party software" is a common term. I've never heard of "first party software", or "second party software".
PS: I'm a native English speaker in the UK.
它与 ISO/IEC 17024 合格评定相关。
第一方：
第二方：
第三方一方：
结论：
我的来源：http:// /www.proftesting.com/blog/2016/09/28/first-second-and-third-party/
It is related to the ISO/IEC 17024 Conformity Assessment.
1st party:
2nd party:
3rd party:
Conclusion:
My Source: http://www.proftesting.com/blog/2016/09/28/first-second-and-third-party/
这是一个在以 Windows 为中心的开发中经常使用的术语：第一方和第二方是我（或你）和 Microsoft；第三方是其他任何人：
有时它指的是客户或最终用户（例如“如果我们从 Microsoft 获得‘可再分发’，则意味着我们可以将其重新分发给‘第三方’”）
更常见的是，它指的是非 Microsoft 的编程供应商我正在使用的工具或库（例如，“NUnit 和 Reflector 都是‘第三方’工具的示例”）。
It's a term that's often used in Windows-centric development: the first and second parties are me (or you), and Microsoft; and the third party is anyone else:
Sometimes it means the customer or end user (e.g. "if we get a 'redistributable' from Microsoft, that means that we can redistribute it to 'third parties'")
More often, it means a non-Microsoft vendor of programming tools or libraries, which I'm using (for example, "NUnit and Reflector are both example of 'third-party' tools").
牛津词典
第三方
名词
除了主要参与某种情况的两个人或团体之外的个人或团体，尤其是。一场争论。
• 作为两党制主要政党的替代组织的政党。
形容词[属性]
除了主要涉及某种情况的两个人或团体之外的个人或团体的或与之相关的：第三方供应商。
Oxford Dictionnary
third party
noun
a person or group besides the two primarily involved in a situation, esp. a dispute.
• a political party organized as an alternative to the major parties in a two-party system.
adjective [attrib.]
of or relating to a person or group besides the two primarily involved in a situation : third-party suppliers.
第一方是网站、程序或游戏的开发者。就像微软或谷歌一样。
第二方是客户，即开发人员作品的观看者。
第三方是外部媒体来源。
The first party is the developer of the website, program, or game. Like Microsoft or Google.
The second party is the client, the viewer of the developer's work.
The third party is an external source of media.
我认为它是代码的来源，所以当谈到库和开发工具时，我会说第一方和第二方是开发工具的开发者和生产者。因此，作为一名 .Net 开发人员，双方是我和 Microsoft，因为我使用 Microsoft 的框架和控件编写代码，然后我也可能使用第三方代码/控件。
I think of it as from where the code comes from, so when it comes to libraries and development tools I'd say that the first and second parties are the developer and the producer of the development tool. So as a .Net developer the parties are me and Microsoft, since I write code using Microsofts framework and controls and I might also then user third party code/controls.
第一方是开发者，第二方是软件用户
1st party is Developer, 2nd party is software user
但它是上下文驱动的。这种情况也适用。
从发展的角度来看：
我正在为我的公司开发一个供内部使用的应用程序（第一方）
我用于该应用程序的大部分“资产”来自 Microsoft（第二方）
但我也使用来自另一家公司（第三方）的数据库，
第一和第二根据角度仍然可以互换。客户甚至不在这张图表上，但这部分是因为这是与其自身规则完全不同的关系。
在谈论法律合同时要小心，因为虽然他们确实经常使用我们正在讨论的第三方一词，但也存在将人员标识为“第一部分 A 的一方、第二部分 B 的一方、第三部分 C, ... 的当事人，第 n 部分的当事人 ...
仅用于列出一堆人，而不指定关系，也可以是第一部分 a,b,c 的当事人。以及第二部分 x,y,z, ... 的各方
It's context driven though. This situation also applies.
From a development perspective:
I'm developing an app for my company for internal use (first Party)
Most of the "assets" that I'm using for the app are from Microsoft (second party)
But I'm also using this database library from this other company (third party)
First and Second remain interchangeable depending on perspective. The customer isn't even on this chart but that's partially because that's an entirely different relationship with it's own rules.
Be careful when talking about legal contracts because while they do often use the term third party as we're discussing, there is also the practice of identifying pe4ople as"the party of the first part A, the party of the second part B, the party of the Third part C, ... , the party of the nth part ...
which serves only to list a bunch of people without specifying a relationship. And it can also be the parties of the first part a,b,c and the parties of the second part x,y,z, ...