CSS Flexbox
CSS Flexbox (Flexible Box Layout) is a CSS layout module designed for creating one-dimensional layouts, allowing items within a container to be aligned, distributed, and resized efficiently along a single axis (either horizontally or vertically). It provides a flexible way to arrange elements in a container, handling complex alignment, ordering, and spacing without relying on floats or positioning hacks. Flexbox simplifies responsive design by enabling dynamic adjustments to layout based on available space.
Developers should learn CSS Flexbox when building modern web interfaces that require responsive, flexible layouts, such as navigation bars, card grids, or form controls, as it offers precise control over alignment and distribution of elements. It is particularly useful for creating layouts that need to adapt to different screen sizes or content changes, reducing the need for media queries and complex CSS. Flexbox is essential for front-end development to handle common UI patterns efficiently and is widely supported across browsers.