A little knowledge about picture description

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The importance of the Alt attribute of the picture believes that there is no need to say much about each seoer, but some beginners have some confusion about it---what is the role of the picture Alt attribute? First of all, what is the picture alt attribute, the so-called picture Alt attribute is the text describing the picture. Descriptive text is not displayed on the page, but is displayed when we place the cursor over the picture. And then its importance, when our speed is too slow when the picture will not appear, the alt attribute of the picture will be visitors to the content of the location, increase the user experience, and most importantly in the description to join the site keyword, you can increase the site's keyword density, when the search engine to crawl the page, The description of the picture can also help the search engine to understand the picture better, and is advantageous to the website rank. Do a picture of the ALT attribute whether the search engine crawling or user experience is beneficial to the harmless, so we must pay attention to the picture alt attribute. Below an example to specify the picture alt attribute of the wording.

If we make a 17.5-meter light special semi-trailer picture, I, low flat half trailer compartment semi-trailer light special semitrailer half trailer, II, light special semi-trailer, III, 17.5 m light special semi-trailer in the goose neck and axle place double reinforcement. From these three options, the third description is the best. I just a simple accumulation of keywords, this may be the search engine that is Blackhat cheating, II is just a keyword, slightly better, but with the model, structure and so did not describe, the user experience is slightly worse. Through the correct picture alt instead of the writing of attributes, can help the site to get a good keyword ranking, so seoer must pay attention to this point.