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Overlays in LeafletJS are layers that are displayed on top of base layers. Overlays can be used to display a variety of information, such as points of interest, lines, polygons, and popups.

To add an overlay to a Leaflet map, you can use the map.addLayer() function. For example, the following code adds a marker overlay to the map:

var marker = L.marker([51.505, -0.09]);
map.addLayer(marker);

You can also add overlay groups to the map. Overlay groups are collections of overlays that can be managed together. For example, you could create an overlay group for all of your point of interest overlays. This would allow you to easily turn on and off all of your point of interest overlays with a single click.

Overlays can be customized in a variety of ways. For example, you can change the color, size, and opacity of overlays. You can also add popups to overlays to display additional information when the user clicks on the overlay.

Here are some examples of how overlays can be used in LeafletJS:

• A map of restaurants with marker overlays that display the location of each restaurant.
• A map of hiking trails with line overlays that show the route of each trail.
• A map of a city with polygon overlays that show the boundaries of different neighborhoods.
• A map of a national park with popup overlays that display information about different points of interest, such as ranger stations and campgrounds.

Overlays are a powerful tool for displaying data on Leaflet maps. By using overlays, you can create maps that are informative, engaging, and useful.

Here are some additional tips for using overlays in LeafletJS:

• Use overlays to display information that is specific to your map. For example, if you are creating a map of restaurants, you could use marker overlays to display the location of each restaurant.
• Use overlay groups to manage your overlays together. This will make it easier to turn on and off different groups of overlays.
• Customize your overlays to make them stand out from the base layer. For example, you could use bright colors and large sizes for your overlays.
• Use popups to display additional information about your overlays. This will make your map more informative and engaging for your users.