Create one large polygon with multiple smaller polygons

[IsabellaBeharrell]

Is there a tool to create one large polygon feature using a existing polygon boundaries? The attributes from the existing polygons are irrelevant - just need the outer boundaries (do not account for features within the polygon cluster) to create one large polygon. Any suggestions?

[DanPatterson_Retired]

If you convert the polygons to points, you might be able to create a concave hull from the shape

https://www.arcgis.com/home/item.html?id=8f41ef2ee8f3400689490de520707c58 

otherwise a convex hull will be probably as good

Minimum Bounding Geometry—Data Management toolbox | ArcGIS Desktop 

[MarkBockenhauer]

Isabella, 

You could try Snap

For example, I have some polygons.

Create or use another polygon that is fairly dense with vertices that encompasses these polygons.

Then use Snap

Click run

Experiment with the distance to get the desired amount of snapping.

mark

[MathieuBoonen]

Dissolve is another method to generate one large polygon if you just want the features  It needs one common attribute to ensure a single polygon is created and IF  they are all touching one another, otherwise you will end up with a multipart polygon.

Alternatively Aggregate Polygons is another Tool which does a nice job from a cartographic sense.