An async function in JavaScript allows you to write asynchronous code that is easier to read and understand. It allows you to use the 'await' keyword to pause the execution of the function until a promise is resolved or rejected. This helps in handling asynchronous operations more conveniently, such as making API calls, reading/writing to databases, or working with files.

Example:

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async function fetchData(url) {
  try {
    const response = await fetch(url);
    const data = await response.json();
    return data;
  } catch (error) {
    console.log(error);
  }
}

In the above example, the 'fetchData' function is declared as async. It uses the 'await' keyword to pause the execution until the fetch request is completed and the response is received. This allows us to write asynchronous code in a more sequential and readable manner.

Web frameworks are software libraries or toolkits that provide developers with a set of pre-written code and functionalities to support web application development. They provide a structured approach to building web applications by offering ready-made components, templates, and tools for tasks such as handling HTTP requests, managing databases, and rendering web pages. Web frameworks make it easier for developers to create dynamic, interactive, and scalable web applications by abstracting away low-level details and providing a set of conventions and best practices. Examples of popular web frameworks include React.js, Angular, Ruby on Rails, Django, and Flask.

SQL stands for Structured Query Language. It is a programming language that is used to communicate with and manage databases. You can use SQL to store and retrieve data from a database, as well as update and delete data in the database. SQL is commonly used in web development and data analysis. Here's an example of using SQL to retrieve data:

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SELECT * FROM customers WHERE age > 25;

This statement selects all columns (*) from the customers table where the age column is greater than 25.

There are several tools and means that can be used when creating a mobile application, such as:

• UI/UX design: Tools such as Figma or Adobe XD can be used to create the user interface and user experience of the application.
• Programming languages: Commonly used programming languages for mobile app development include Java (Android) and Objective-C/Swift (iOS).
• IDEs: Integrated development environments (IDEs) such as Android Studio and XCode can be used to write and test code.
• Testing: Tools like TestFairy and Appium can be used for testing the mobile application.
• Debugging: Debugging tools such as HockeyApp and Fabric can be used to fix bugs.
• Databases: Databases such as Firebase and MongoDB can be used to store and manage data.
• Analytics: Tools such as Google Analytics and Mixpanel can be used to track user engagement and to better understand user behavior.

Back end tools refer to the technologies that are needed to develop the back end of websites, such as run time environments, web servers, databases and web frameworks. Examples of popular back end tools are Node.js, Apache, MongoDB, Ruby on Rails and PHP.

It depends on the job you are considering as a cloud practitioner, but coding is often required. Cloud practitioners can use languages such as Python, Java, Ruby, and JavaScript which are commonly used to create applications or automate tasks in the cloud. They may also have to understand concepts like software architecture, data structures, and algorithms. Additionally, understanding DevOps processes and various cloud services such as containerization, databases, storage solutions, and serverless functions will be helpful.

There are a variety of free image databases API's available.

One option is the Pixabay API. Pixabay offers hundreds of thousands of free stock photos, vectors, and art illustrations. It supports several programming languages including JavaScript, PHP, Python, Java, Ruby, Node.js, and C#.

Another option is the Flickr API. Flickr offers millions of free publicly available photos, with photos from users around the world. It also supports a variety of API's including REST API, JSON API, and XML API.