The following html snippet has been taken from the following link (you can inspect it there in the page) https://en.wikipedia.org/wiki/Main_Page
<input class="vector-search-box-input" type="search" name="search" placeholder="Search Wikipedia" aria-label="Search Wikipedia" autocapitalize="sentences" title="Search Wikipedia [alt-shift-f]" accesskey="f" id="searchInput" autocomplete="off">
It indicates one search box, where we can write something for the same purpose.
Here you can see the locator is Name and its given as this- name=”search”
The syntax to identify the Name locator using selenium is given below.
driver.findElemnt(By.name(“search”)).sendKeys(“write something here to search”);
To know how does this driver object come, you have to check the post on –Different web drivers invoking using selenium java