DISSOLVE
Use the Dissolve process to remove boundaries or nodes between adjacent polygons or lines that have the same value for specific attributes.
In simple terms this will merge the polygons which contains the same attributes.
Now we are going to dissolve district of Sri Lanka in to Province of Sri Lanka, or you can use whatever dataset you like to use,
Steps,
1. Open ArcMap and add data you are going to use for this project,
2. Then right click on the layer you have added, and then select the "Open attribute table",
3. Now you can see the attributes of your layer, then you can get idea what field you have to use for the Dissolve to your output.
4. Select "Dissolve" tool,
5. Then you have to select what field you are going to Dissolve to get your output, in this example I have use "Province" field.
6. Now you can see Dissolve has completed as result taken as layer "Province" to the ArcMap,
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