Graffiti can be defined as unauthorized writing or drawing on a public surface, often used as a form of public art or to communicate a message.

People create graffiti for a variety of reasons, including expressing themselves, making a statement, protesting against something, or simply beautifying a space.

There are many different types of graffiti, including tags, throw-ups, murals, and stencil graffiti.

Tags are usually smaller and simpler than throw-ups, and are typically done with a single color. Throw-ups are usually larger and more complex, and are typically done with multiple colors.

A mural is a large painting on a wall, which can be considered a type of graffiti and a form of public art.

Stencil graffiti is a type of graffiti created using a stencil, which is a sheet of material with a design cut out of it.

Graffiti can have a number of positive effects, including beautifying a space, expressing a message, and bringing people together.

Graffiti can also have a number of negative effects, including being unsightly, disrespectful, and illegal.

Whether or not graffiti is considered art is a matter of opinion. Some people believe that it is a form of public art, while others believe that it is vandalism.

In most places, graffiti is considered to be illegal. However, there are some places where graffiti is legal or even encouraged.

Graffiti can be used to make a change in a number of ways, including raising awareness about an issue, protesting against something, and beautifying a space.

Graffiti artists face a number of challenges, including the risk of being arrested, fined, or harassed by the police.

There are a number of things that can be done to support graffiti artists, including legalizing graffiti in certain areas, providing graffiti artists with spaces to work, and educating the public about the positive aspects of graffiti.

The future of graffiti is uncertain. It is possible that it will continue to be a controversial art form, that it will become more accepted as a form of public art, or that it will decline in popularity. It is also possible that graffiti will evolve into something new and different.

This is a personal opinion question and there is no right or wrong answer.