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The James Webb Space Telescope has been in development for many years, has cost tens of billions of dollars, and is quite probably the most complex machine ever created by mankind. Because of the way its mirrors are arranged, it must have a wide field of view and an extensive infrared spectrometer, and a near-infrared detector for spectroscopy of large sections of the universe. Its shape has also been such that the sun’s light striking its main mirror has had to be split into two separate light streams to allow the telescope to have a sun-Earth stabilizing role.
The telescope and the spacecraft used to take it into space were designed by Northrop Grumman and built by Lockheed Martin. Construction of the telescope began in 2009 and was completed in October 2014.
NASA has been building the telescope for five years. Now the final test is about to begin.

The Launch Date of James Webb Space Telescope

The James Webb Space Telescope will launch on 18th December 2021 with the help of the Ariane 5 rocket.

Structure of James Webb Space Telescope

The launch started with the mission’s official specs, given in NASA’s full report: Like many early missions, JWST is "deep" (lots of light-gathering power), "light" (a tiny mirror), and "space-wise" (intensively made to fit into a rocket’s cargo bay). The main mirror is 11.4 feet across, with 3.4 million S.C.F. (square centimetres), it is fully cold-cathode, and features smaller cutting regions. This makes it more difficult to mount, but much lighter than many typical telescopes. The circumference is 5.2 feet, so there’s a lot of thermal shielding around the mirrors and the structure to keep out the heat and noise of the launch. It will probably carry the largest sun shield ever built for space.

What James Webb Telescope can look at

The Webb telescope will study stars, galaxies, black holes, solar systems and planets. Its far-infrared camera and spectrograph will search for the first stars, galaxies, and first stars formed after the Big Bang. The telescope will also detect ultraviolet light from the most distant objects in the universe, as well as the earliest light from the Big Bang. It will also study the earliest objects in the universe, and the mysterious magnetism and electrical fields around black holes.
Scientists said the telescope can detect and identify objects in space and throughout the universe to be magnified 100 times and viewed at times the world has never seen before. The construction of JWST is part of NASA’s 25-year mission to study our universe.

Conclusion

Since the recent report, a report this week that said the new James Webb Telescope would have its spectrographs operated in space at the launch site in the event of a launch failure may have shifted the most recent launch time estimate up to December or January 2022 and The new launch date of JWST is December 18, 2021, which was announced in September.
The James Webb Space Telescope will come to a destination called the Sun-Earth L1 Lagrange point.