Custom Website is a website designed and developed around a specific brand, user experience, technical requirement, or business goal.
It matters because development decisions affect speed, security, scalability, tracking, SEO, and maintenance. A site that looks good but is fragile or hard to update can quietly hold back every marketing channel.
Example
A distributor needs customers to request quotes for several products in one submission. A custom website can implement that workflow around the distributor’s data and review process instead of forcing it into a standard shopping-cart design.