What is the difference between a Wi-Fi extender and an external antenna?

What is Wi-Fi Extender ?
A Wi-Fi extender, also known as a Wi-Fi repeater or range extender, is a device that helps increase the coverage area of a Wi-Fi network by amplifying the existing Wi-Fi signal from a router or access point and rebroadcasting it. Here's how it works and some key points about Wi-Fi extenders:

Signal Amplification: A Wi-Fi extender receives the Wi-Fi signal from the primary router or access point and then amplifies it before rebroadcasting it. This amplified signal can reach areas of a home, office, or other space where the original Wi-Fi signal might be weak or nonexistent.

Extended Coverage: The primary purpose of a Wi-Fi extender is to extend the coverage area of a Wi-Fi network, allowing devices farther away from the main router to connect to the network with a stronger signal. This is particularly useful in larger homes, offices, or spaces with multiple floors where the Wi-Fi signal might not reach all areas effectively.

Setup: Setting up a Wi-Fi extender typically involves connecting it to the existing Wi-Fi network and positioning it in a location where it can receive a strong signal from the primary router while also providing coverage to the desired area. Most extenders have a setup process that can be completed through a web interface or a mobile app.

Network Name: Wi-Fi extenders often create a new network with its own SSID (network name) and password. Devices can connect to this extended network to access the internet through the extender, but they can also seamlessly switch between the original network and the extended network based on signal strength.

Types: Wi-Fi extenders come in various forms, including plug-in models that simply plug into a power outlet and desktop models that need to be placed on a flat surface. Some models also feature external antennas to further improve signal strength and coverage.

Considerations: While Wi-Fi extenders can be effective in extending Wi-Fi coverage, they may also introduce some latency or signal degradation due to the additional hop in the network. Additionally, the placement of the extender is crucial for optimal performance, as placing it too far from the primary router or in an area with interference can diminish its effectiveness.