What is espressif on my wifi?

Espressif Systems is a Chinese company that designs and sells wireless communication chips and system-on-chips (SoC) for internet of things (IoT) applications. Their most popular product line is the ESP8266 and ESP32, which are used to make Wi-Fi enabled devices such as smart home appliances, IoT sensors, and other connected devices.

Espressif's chips and SoCs are known for their low power consumption, low cost, and ease of use. They also offer a variety of development tools and software libraries to help developers create applications and firmware for their products. Espressif's products are used by many companies and individuals around the world for creating IoT solutions.