Information

Admission requirements for a Master's degree abroad can vary from programme to programme, but luckily there are also many similarities, whether you want to study in the USA, China, Germany or anywhere around the globe.
The purpose of an application fee receipt, of photos, and ID copies is pretty obvious. The university needs to be able to recognize you and accept your application. However, other common requirements may determine whether you will get a place in the study programme you apply to. 
Copies of diplomas from your previous studies
In your Master's application to a university abroad you will be asked to add certified copies of your previous graduation diplomas, translated into English. While most Master's applications only require a Bachelor's diploma, some programmes will also ask for a high school graduation diploma.
Universities need these documents to have proof that you attended and graduated from previous cycles of education in order to qualify to a graduate programme.
However, these diplomas usually include data about the educational institution you attended, your Grade Point Average (GPA), final grades, or Bachelor's thesis.  
The university admission board will take into account the reputation of the university where you graduated from, but also what your GPA and final exam marks say about you. 
If you have good final exam/thesis grades, they will know you have taken your studies seriously and you are capable of academic excellence. But don't worry, if you do not have high grades, you will not be disqualified. There are many other ways in which you can win over the commission: volunteering activities, a strong motivation, and good references also count a lot.
Academic Transcripts from your Bachelor's studies
Academic transcripts give the university full details about the courses and modules you studied at undergraduate level and the grades you received. Universities expect these transcripts to be official copies and not screenshots or printed pages.
Academic transcripts are important because seeing what courses you took can help universities decide if you have the necessary background and skills for the Master's you are applying to.
At the same time, they can see at which subjects you performed better and which subjects are "weak spots" you need to improve on. That is why it is important that you have bigger grades at the undergraduate courses that are most relevant for the Master's programme you chose.
Let's take an example. Say you graduated from a Political Science Bachelor's and you want to study a Master's in International Relations. The application commission will be more interested if you followed any International Relations courses such as International Law or European Studies rather than on courses like Domestic Politics. 
So, if you have lower course grades at the latter, it will probably not impact your application as much as lower grades in International policy-related courses.
Proof of language proficiency
When applying to a degree abroad, chances are that you will study in English or another popular foreign language (German, French, etc.). For this reason, universities need to know that language will not be a barrier in your studies; that you are able to understand and use that language at an academic level.

For English-taught Master's universities will typically require official language certificates such as IELTS, PTE Academic, TOEFL, C1 Advanced, etc. When they demand a specific score, it means they really expect you to have that score. The higher the score, the more they will be convinced that you master English skills.

There is also the case when universities will not demand a language certificate as long as your Bachelor's was English-taught. In this case, they will pay attention to any English-language courses found in your transcript of records, such as "Academic English".