JavaScript is a programming language commonly used for web development. An array is a data structure that stores a collection of elements.

• JavaScript is a high-level, interpreted programming language used for creating interactive websites.

• Arrays in JavaScript are used to store multiple values in a single variable.

• Example: var fruits = ['apple', 'banana', 'orange'];

There are 7 data types in JavaScript: undefined, null, boolean, number, string, symbol, and object.

• JavaScript has 6 primitive data types: undefined, null, boolean, number, string, and symbol.

• The 7th data type is object, which includes arrays, functions, and objects themselves.

• Each data type has its own set of values and behaviors in JavaScript.

Padding in an image can be added using CSS properties like padding-top, padding-bottom, padding-left, padding-right.

• Use CSS properties like padding-top, padding-bottom, padding-left, padding-right to add padding to an image.

• Padding can be specified in pixels, percentages, or other units.

• Example: img { padding: 10px; }

Memory management is crucial for efficient application development.

• Use dynamic memory allocation only when necessary.

• Avoid memory leaks by freeing allocated memory when it is no longer needed.

• Use data structures that minimize memory usage.

• Optimize code to reduce memory usage.

• Use tools like valgrind to detect memory errors and leaks.

HTML tag is a code element used to define different parts of a webpage.

• HTML tags are enclosed in angle brackets, like .

• Tags are used to define the structure and content of a webpage.

• Examples of HTML tags include

  for paragraphs,

  for headings, and for links.

Improving app performance requires optimizing code, reducing network calls, and minimizing resource usage.

• Optimize code by identifying and fixing bottlenecks

• Reduce network calls by caching data and using efficient protocols

• Minimize resource usage by releasing unused memory and optimizing database queries