Can you explain what the term 'anchor' means in the context of development or marketing?

In the context of development and marketing, the term "anchor" has different meanings:

• In development (especially UI/UX and iOS): an anchor is a point of attachment for a UI element that determines how the element is positioned and scaled relative to its parent container or other elements. For example, in Auto Layout for iOS, an anchor is an NSLayoutAnchor that allows setting constraints for positioning elements.

  Example in Swift:

  let button = UIButton()
  button.translatesAutoresizingMaskIntoConstraints = false
  view.addSubview(button)
  NSLayoutConstraint.activate([
      button.topAnchor.constraint(equalTo: view.topAnchor, constant: 20),
      button.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20)
  ])
  

• In marketing: an anchor is a "reference" price or information that serves as a benchmark for perceiving the cost or value of a product. For example, a high initial price can serve as an anchor, making a discount seem more attractive.

Thus, an anchor is either a point of attachment in the interface or a reference for perception in marketing.