A bollard is a short post used to create a protective or architectural perimeter. When installed primarily as a visual guide, bollards guide traffic and mark boundaries.
Bollards can also protect people and property. These security bollards may have decorative elements or be chosen to complement the landscape, but their primary consideration is resistance to impact forces.
Bollards can be made of cast iron or steel, depending on their needed function.
They come in a wide variety of shapes and styles to accentuate or visually stand out in their settings. 

Bollard definition:

"short post placed to deflect traffic from an area"
Like the etimology proves bollards mark a place.
Bollards often reflect or enhance the environment they are in.

BOLLARD APPLICATIONS:

Bollards have become a ubiquitous part of the modern landscape. Planners and architects use them to manage both pedestrian and vehicle traffic, enhance landscape and architecture, light pedestrian pathways, secure and protect buildings and people, and provide bike parking. Bollards are also now being used indoors, in warehouses, for asset protection.

Street bollards:
Traffic bollards are used to guide traffic toward appropriate areas while ensuring clear sight lines and allowing pedestrian access. They can guide cars by creating roadway demarcation, or prevent access to restricted areas like bike lanes, public squares, and traffic islands. On roadways without curbs, they can be used to prevent vehicles straying from the street.            

Pedestrian bollards:

In many landscapes and properties, decorative bollards are used to define distinct pedestrian areas. A line of bollards around a building may define its perimeter and add architectural flair. Bollards can be used to contain a playground or park, allowing easy access but discouraging its use as a throughway. When linked with chain, a line of bollards can encourage pedestrians to stay on marked paths, without forming a closed barrier that prevents all crossing.

Bicycle parking:

Bicycle parking bollards are suitable for safe short-term bike lock-up.   Bike bollards do double duty for the organizations and businesses that install them: like all bollards they help with vehicle or pedestrian traffic management, but they also attract cycling customers, encourage sustainability, and reduce the obstruction and damage that can come from improperly parked bikes.

Bollard styles:

1.Traditional design

Traditional bollards are finished in black and made of cast iron and are a highly decorative part of the land- or street-scape. Even if these traditional bollards are not installed especially in a way to be impact resistant to vehicles, they still provide a solid and serious looking profile and can be an assertive visual deterrent.

2.Modern design

Contemporary architectural styles often require modern bollard design. Bollards come in a variety of lengths, widths, colors, and materials to match any image. Whether a sleek stainless-steel bollard outlining a pedestrian area or other type a wide range of bollard options give planners many choices.

BOLLARD INSTALLATION:

Contemporary architectural styles often require modern bollard design. Bollards come in a variety of lengths, widths, colors, and materials to match any image. Whether a sleek stainless-steel bollard outlining a pedestrian area or other type a wide range of bollard options give planners many choices.
Fixed Bollards:
Embedded bollards are fixed permanently into place as part of the structural site design of an outdoor space. They are made of durable or stainless steel/cast iron. When installed properly, they can provide asset security, as well as being a visual guide and architectural complement. Some fixed bollards are plain posts made of durable steel and concrete that are enhanced with a decorative bollard cover. Traditional, ornate, modern, or high-visibility covers are available. Fixed bollards can also be purchased in modern stainless steel styles that do not need additional ornamentation.
Removable bollards
Removable bollards can be temporarily taken down to allow vehicular access to normally-restricted areas. They have a base that is permanently installed in the ground in which a bollard post can be inserted and locked in place. When desired, these bollards can be unlocked and pulled out allowing access for maintenance, delivery, or emergency vehicles. Removable bollards are an ideal solution for changing access applications and are generally more cost sensitive than retractable bollards. They are commonly installed at parks, in courtyards, alleyways, and other large venues like stadiums. These bollards are available in a wide variety of materials, ranging from steel to composite plastic. There are a variety of mounting options for removable bollards in either new or existing concrete.

In conclusion, bollards are noted for the role they play in improving public spaces and increasing the safety of the people.