You’ll see a few main kinds, each built for a different need:

• Travel plug adapters: Change the plug shape to match outlets in the US, EU (Type C), UK (Type G), AU (Type I), and more.
• All-in-one travel adapters: Multiple slide-out/attachable plugs with USB ports for phones and tablets.
• Voltage converters: Reduce 220–240V to 110–120V for certain appliances; check device wattage before use.
• Wall taps/outlet extenders: Add more outlets (often with USB), sometimes with surge protection.
• 2‑to‑3 prong converters: For older two-slot outlets; grounding method is important.
• Heavy‑duty splitters: Rugged 3‑way adapters for rated indoor/outdoor use.

You can compare options at Walmart by outlet type, USB ports, surge protection, and safety certifications.

It depends on the type:

• Travel plug adapters change the shape of your plug so it fits a different country’s outlet. They don’t change voltage.
• Wall tap/outlet adapters expand a single outlet into several and may add USB ports or surge protection.
• Voltage converters step 220–240V down to 110–120V for select devices. These are different from simple plug adapters.

Before you buy, check your device label for “Input: 100–240V” and its wattage. Dual‑voltage items usually just need the right plug shape, while high‑wattage appliances may require a properly rated converter. Choosing based on your destination and device specs can help you get a safe, compatible setup.

Here’s a quick guide to common outlet styles:

• Type A/B: Two flat blades (with/without ground). Used in the United States.
• Type C: Two round pins (Europlug). Used across much of continental Europe.
• Type E/F: Round, recessed sockets found in many European countries; typically accept Type C plugs.
• Type G: Three rectangular pins. Used in the United Kingdom and some other regions.
• Type I: Two angled flat blades plus ground. Used in Australia and nearby regions.
• Type J: Three round pins. Used in Switzerland and Liechtenstein.

Country standards can vary, so it’s a good idea to verify your destination’s exact plug type and voltage. Then select either a single‑region adapter or an all‑in‑one travel adapter that covers multiple standards.

Type C (often called the Europlug) has two round pins on a slim, ungrounded body. It’s designed to fit many European-style sockets and typically works with Type C and some Type E/F outlets found across continental Europe.

• Shape: Two round pins, closely spaced, with a compact, low-profile plug.
• Grounding: No dedicated ground pin; it’s for ungrounded connections.
• Compatibility note: It doesn’t fit the United Kingdom’s Type G sockets without an adapter.

Remember, plug shape isn’t the same as voltage. If your device isn’t dual‑voltage, you may also need a voltage converter in addition to the Type C plug adapter.

These adapters can be helpful in older homes, but safety matters:

1. Confirm grounding: Only use one where the outlet box is properly grounded. The adapter’s metal tab or wire should connect to the outlet’s center screw to establish a ground path.
2. Know the limits: Stay within the adapter’s amp/watt rating and avoid high‑draw appliances if the outlet’s grounding is unknown.
3. Indoor use: Keep them dry and use them only in appropriate indoor locations.
4. Check for certification: Look for a recognized safety certification mark.
5. When in doubt: Consider upgrading the outlet or consult a licensed electrician for a properly grounded solution.

This approach can help reduce risk, but installations and conditions vary.