Designed to be easy to use, ArcPad provides an extensive set of tools for mobile GIS applications and tasks.
GIS Data Collection
Create, edit, and analyze GIS data in the form of industry-standard vector and raster image files. Use data validation from your existing geodatabase, such as subtypes and domains, or create multiple records for a single feature using related tables. Connect to Esri feature services (hosted or on-premises) via ArcGIS for Server and ArcGIS Online.
External Hardware Integration
ArcPad supports field devices, such as GPS receivers, range finders, barcode scanners, and digital cameras, with GIS data collection. Input from these devices is stored within the GIS.
ArcPad Data Manager Extension for ArcGIS for Desktop
A mobile component of ArcGIS, ArcPad integrates with desktop GIS technologies to allow field edits to be incorporated into a geodatabase through disconnected editing. It replaces the ArcPad tools for ArcGIS for Desktop that came with previous versions of ArcPad.
ArcPad AXF Reader
Using the ArcGIS Data Interoperability Extension (or FME 2012), the ArcPad AXF (Archive eXchange Format) Reader lets you view AXF files in ArcGIS for Desktop. Browse the contents of your AXF in ArcCatalog, then drag and drop your AXF layers onto your map. You can also export AXF feature layers into native and external formats using ArcGIS Data Interoperability tools.
Symbology and Style Sheets
ArcPad enables high-quality mapping on mobile devices through supporting ArcGIS symbology and style sheets.
Create custom mobile GIS applications and tasks with ArcPad Studio. ArcPad Studio is the development framework for creating extensions, applets, and tools with ArcPad.
ArcPad accommodates localized languages. The ArcPad user interface is available in a number of languages, making it easier for mobile field-workers whose native language is not English.
The StreetMap extension is based on StreetMap Premium for ArcGIS data derived from the TomTom (formerly TeleAtlas) dataset and now includes data for Europe in addition to North America. This extension is part of core ArcPad functionality and is included at no extra cost. It supports the Smart Data Compression (SDC) format and enables display, address geocoding, reverse geocoding, and routing capabilities.
(Source – http://www.esri.com/software/arcgis/arcpad/features#streetmap_panel)