The black hole, of course, is black, so it cannot be seen. However, the Universe has given us a consolation prize: material falling into a black hole falls into an accretion disk outside the event horizon. That material becomes extremely hot and glows with light that we can see, and it is this light that may be detected.
Here is the amazing image:
The sharpest picture ever taken toward Sgr A* (the supermassive black hole at the center of our Milky Way galaxy), which is known as the “Eye of Sauron.” The ring of light is caused by hot material swirling around it. We can’t see the black hole itself, but it does consume light, so we see a dark void in the middle of the ring. Photo: EHT Collaboration