"Mastering Visa English: Key Skills for a Successful International Travel Application" is a phrase that refers to the importance of understanding and effectively using English in the context of applying for a visa to travel internationally. Here's a breakdown of what this phrase means:

1. **Visa English**: This refers to the English language proficiency required for visa applications. Many countries require non-native English speakers to demonstrate a certain level of English proficiency as part of their visa application process. This is often assessed through standardized tests like the International English Language Testing System (IELTS) or the Test of English as a Foreign Language (TOEFL).

2. **Mastering**: This term implies a high level of proficiency and control over the subject matter. In the context of visa English, it suggests that the individual has not only a good understanding of the English language but also the ability to use it effectively in the specific context of visa applications.

3. **Key Skills**: These are the essential abilities or knowledge that one must possess to successfully navigate the visa application process. For visa English, these skills might include understanding visa requirements, being able to fill out application forms accurately, writing a compelling cover letter, and effectively communicating with embassy or consulate staff.

4. **Successful International Travel Application**: This phrase refers to the end goal of the visa application process, which is to be granted permission to travel to another country. A successful application is one that meets all the requirements set by the destination country and is approved.

5. **1000 Words Explanation**: This suggests that a detailed explanation or essay of approximately 1000 words is being requested or provided to explain the concept in depth. This could include discussing the reasons why English proficiency is important for visa applications, strategies for learning and practicing visa English, and tips for ensuring a successful application.

In summary, the phrase is about the importance of being proficient in English for the purpose of applying for a visa to travel internationally. It suggests that there are specific skills and knowledge that can help ensure the success of such an application, and it implies that a detailed explanation or discussion on this topic is being provided or requested.