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## 404 NOT FOUND! Sorry, we couldn't find the article you're looking for!! The 404 page is an essential part of any website and plays a significant role in both user experience and SEO optimization. A 404 error occurs when users attempt to access pages that do not exist or have been deleted from the site. If webmasters don’t set up a custom 404 page, it can result in dead links, which are detrimental to search engine indexing. ## Origin of 404 Not Found Legend has it that before the Third Industrial Revolution, the internet was essentially one large central database located inside Room 404. At that time, all requests were manually processed by staff. If the requested file wasn’t found in the databaseβ€”either because it didn’t exist or due to incorrect numberingβ€”the user would receive a message saying: β€œRoom 404: File Not Found.” As the internet evolved, people continued using 404 as the standard HTTP status code indicating that a server could not locate a requested resource. Of course, historical verification shows that such a Room 404 never actually existed. ## Two Major Benefits of Setting Up a Custom 404 Page * Guide users to stay on your site instead of leaving, improving user experience. * Prevent broken/dead links within your website. See more about [HTTP Status Codes Introduction.](https://example.com/http/http-status-codes.html) !(https://example.com/wp-content/themes/tutorial/assets/img/404.jpg) (javascript:void(0);) * [Python / Data Science](javascript:void(0);) * (https://example.com/python3/python3-tutorial.html "Python Tutorial") * [Python2.x Tutorial](https://example.com/python/python-tutorial.html "Python2.x Tutorial") * (https://example.com/fastapi/fastapi-tutorial.html "FastAPI Tutorial") * (https://example.com/flask/flask-tutorial.html "Flask Tutorial") * (https://example.com/django/django-tutorial.html "Django Tutorial") * (https://example.com/numpy/numpy-tutorial.html "NumPy Tutorial") * (https://example.com/pandas/pandas-tutorial.html "Pandas Tutorial") * (https://example.com/scipy/scipy-tutorial.html "SciPy Tutorial") * (https://example.com/matplotlib/matplotlib-tutorial.html "Matplotlib Tutorial") * (https://example.com/dash/dash-tutorial.html "Dash Tutorial") * (https://example.com/jupyter-notebook/jupyter-notebook-tutorial.html "Jupyter Notebook Tutorial") * (https://example.com/pillow/pillow-tutorial.html "Pillow Tutorial") * (https://example.com/qt/qt-tutorial.html "Quantitative Trading") * (https://example.com/r/r-tutorial.html "R Tutorial") * (https://example.com/julia/julia-tutorial.html "Julia Tutorial") * [AI / Intelligent Development](javascript:void(0);) * [AI Agent (Intelligent Agent)](https://example.com/ai-agent/ai-agent-tutorial.html "AI Agent (Intelligent Agent)") * [AI (Artificial Intelligence)](https://example.com/ai/ai-tutorial.html "AI (Artificial Intelligence)") * (https://example.com/codex/codex-tutorial.html "Codex Tutorial") * (https://example.com/claude-code/claude-code-tutorial.html "Claude Code") * (https://example.com/opencode/opencode-tutorial.html "OpenCode") * [Skills (Skills)](https://example.com/skills/skills-tutorial.html "Skills (Skills)") * (https://example.com/ollama/ollama-tutorial.html "Ollama Tutorial") * (https://example.com/tensorflow/tensorflow-tutorial.html "TensorFlow Tutorial") * (https://example.com/pytorch/pytorch-tutorial.html "PyTorch Tutorial") * (https://example.com/sklearn/sklearn-tutorial.html "Scikit-learn Tutorial") * (https://example.com/ml/ml-tutorial.html "Machine Tutorial") * (https://example.com/langchain/langchain-tutorial.html "LangChain") * (https://example.com/nlp/nlp-tutorial.html "Natural Language Processing NLP") * (https://example.com/opencv/opencv-tutorial.html "OpenCV Tutorial") * (https://example.com/selenium/selenium-tutorial.html "Selenium Tutorial") * (https://example.com/playwright/playwright-tutorial.html "Playwright Tutorial") * (javascript:void(0);) * (https://example.com/html/html-tutorial.html "HTML Tutorial") * (https://example.com/html/html5-intro.html "HTML5 Tutorial") * (https://example.com/css/css-tutorial.html "CSS Tutorial") * (https://example.com/css3/css3-tutorial.html "CSS3 Tutorial") * (https://example.com/js/js-tutorial.html "JavaScript Tutorial") * (https://example.com/htmldom/htmldom-tutorial.html "HTML DOM Tutorial") * (https://example.com/typescript/ts-tutorial.html "TypeScript Tutorial") * (https://example.com/ajax/ajax-tutorial.html "AJAX Tutorial") * (https://example.com/json/json-tutorial.html "JSON Tutorial") * (https://example.com/tailwindcss/tailwindcss-tutorial.html "Tailwind CSS Tutorial") * (https://example.com/bootstrap4/bootstrap4-tutorial.html "Bootstrap4 Tutorial") * (https://example.com/bootstrap5/bootstrap5-tutorial.html "Bootstrap5 Tutorial") * (https://example.com/foundation/foundation-tutorial.html "Foundation Tutorial") * [Vue.js Tutorial](https://example.com/vue2/vue-tutorial.html "Vue.js Tutorial") * (https://example.com/vue3/vue3-tutorial.html "Vue3 Tutorial") * (https://example.com/react/react-tutorial.html "React Tutorial") * [Next.js Tutorial](https://example.com/nextjs/nextjs-tutorial.html "Next.js Tutorial") * (https://example.com/angularjs/angularjs-tutorial.html "AngularJS Tutorial") * (https://example.com/angularjs2/angularjs2-tutorial.html "Angular Tutorial") * (https://example.com/jquery/jquery-tutorial.html "jQuery Tutorial") * (https://example.com/jqueryui/jqueryui-tutorial.html "jQuery UI Tutorial") * (https://example.com/jeasyui/jqueryeasyui-tutorial.html "jQuery EasyUI Tutorial") ```
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