FreeNotes
Sources of data refer to the origins or mediums from which data is collected for analysis. These can be direct or indirect sources, structured or unstructured. Three examples of data sources, excluding those in the book, are: Social media platforms: User-generated content on platforms like Twitter or Facebook provides valuable data for sentiment analysis, customer … Read more
Machine learning and deep learning are both subfields of artificial intelligence, but they differ in complexity and application. Machine learning focuses on algorithms that learn from data through statistical techniques and require less computational power compared to deep learning. Deep learning, a subset of machine learning, involves neural networks with many layers, requiring large datasets … Read more
Databases are crucial in data science as they provide structured storage for vast amounts of data, which is essential for analysis and modeling. Databases enable easy access, retrieval, and management of data, ensuring consistency and reducing redundancy. Data scientists rely on databases to store cleaned, processed data, and to perform queries to extract relevant information. … Read more
Data science is instrumental in solving business problems by leveraging statistical techniques, machine learning, and predictive modeling to extract insights from data. Businesses can make data-driven decisions, predict trends, optimize processes, and personalize customer experiences. For example, a company can use data science to analyze customer purchasing patterns and forecast demand, enabling better inventory management. … Read more
Data analytics involves examining datasets to draw conclusions about the information they contain. It focuses on interpreting data, identifying patterns, and summarizing findings. Data science, however, is broader and involves using scientific methods, algorithms, and systems to analyze large datasets and extract meaningful insights. While data analytics can be considered a subset of data science, … Read more
Document Object Model (DOM) – Detailed Explanation The Document Object Model (DOM) is a programming interface for web documents. It represents the structure of a document, such as an HTML or XML document, as a tree of objects. The DOM provides a way for programs (typically JavaScript) to interact with the structure, content, and style … Read more
External CSS is a separate stylesheet file that defines the design and layout of a webpage. It is linked using the <link> tag in the <head> section of an HTML document: <link rel=”stylesheet” href=”styles.css”> External CSS is widely used in large projects to maintain consistency and reduce redundancy. It allows easy updates across multiple pages … Read more
Event-based code in JavaScript executes functions when a specific event occurs, such as a click, hover, or key press. This is achieved using event listeners like onclick, onmouseover, and onkeydown. For example: <button onclick=”alert(‘Button clicked!’)”>Click Me</button> Here, when the button is clicked, an alert box appears. JavaScript’s addEventListener() method provides more control by allowing multiple … Read more
The <body> tag in HTML defines the main content of a webpage that is visible to users. It contains text, images, tables, links, videos, and other elements necessary for a webpage’s functionality. All structural elements such as <h1>, <p>, <div>, and <table> are enclosed within the <body> tag. This tag also allows styling through attributes … Read more
Some commonly used HTML text-related tags include: <p>: Defines a paragraph. <h1> to <h6>: Defines headings, from largest to smallest. <b>: Makes text bold. <i>: Italicizes text. <u>: Underlines text. <br>: Inserts a line break. <hr>: Inserts a horizontal line. <strong>: Highlights important text. <em>: Emphasizes text with italics. These tags are essential for structuring … Read more