hot spot

noun

• 1a small area or region with a relatively hot temperature in comparison to its surroundings.
• a very hot and dry place where a fire is likely to start, or where a fire has been burning:most of the fires were out Monday, but crews were still watching for hot spots
• Geology an area of volcanic activity, especially where this is isolated.

• 2a place of significant activity or danger:a hot spot of commerce they identified eight pollution hotspots at the mouth of the Thames
• a popular place of entertainment:she knew all the Manhattan hot spots for classy blues and retro jazz

• 3an area on a computer screen that can be clicked to activate a function.
• a public place with an available wireless signal for Internet access.