A scientific calculator is an essential tool for students, engineers, and professionals, offering advanced mathematical functions beyond basic arithmetic. These calculators support operations such as trigonometric, logarithmic, and exponential functions, as well as complex number calculations and statistical analysis. Modern scientific calculators often feature multi-line displays, allowing users to input and review expressions as they appear in textbooks, enhancing usability and learning. Some models also provide programmability, enabling users to store and execute custom functions for repetitive calculations. Additionally, online scientific calculators have become increasingly popular, offering accessibility and convenience without the need for physical devices. These web-based tools provide similar functionalities, including support for fractions, percentages, and advanced mathematical operations, making them a versatile resource for various computational needs.