One of the key techniques in quantum computing is entanglement, which links qubits in such a way that the state of one qubit can instantly influence the state of another, regardless of distance. This unique behavior enables quantum computers to solve certain types of problems more efficiently than classical systems, making them powerful tools for tackling issues that would otherwise take years to compute. Though still in its early stages, quantum computing holds immense promise for the future, with companies and researchers worldwide racing to unlock its full potential.

A significant tool for implementing responsive designs in CSS is the media query. Media queries allow developers to apply specific styles based on device characteristics such as screen width, height, or orientation. For instance, you can use a media query to display a two-column layout on larger screens and a single-column layout on smaller screens.

Specificity determines which CSS rules take precedence when multiple selectors target the same element. Specificity values are based on the selector type; for instance, IDs have higher specificity than classes, and classes have higher specificity than element selectors.

Gradients in CSS allow for smooth transitions between colors, adding depth and dimension to a design. There are two main types: linear and radial gradients. Linear gradients transition colors along a straight line, while radial gradients radiate colors outward from a central point.