One example of this is when dealing with automatic telephone menus. Unfortunately sometimes these programs cannot recognize when someone is speaking with an accent. This can mean that certain words get misunderstood and this can result in a lot of unnecessary delays.
Another practical problem that can occur is with automatic menu systems or computer games that use voice recognition. Unfortunately a number of these systems are flawed in the sense that they may not always be able to adapt to regional accents or dialects. This can then result in a lot of frustration as people attempt to clarify their speech patterns but find the machine still does not understand them.
When trying to pronounce words more clearly it is best to use either an American or British style of pronunciation. While there are other variants of English these tend to be the ones that people are more likely to understand and tend to be the clearest. It also makes it easier when learning words without having to adapt to different patterns of speech.
Broadly speaking the way you pronounce consonants in American and British styles of speech are pretty much the same. The main difference is that an r or a t will be pronounced differently after a vowel is spoken and the British style tends to use a larger range of vowel sounds.
The easiest way to learn how to say a word in either style is to hear it. Fortunately there is a wide range of ways to listen to how words are said. You may not necessarily need a formal English language learning course in order to do this although a lot of people can benefit from a more formal learning structure.
Another way to do this is to find things that you like as you are more likely to engage with it. Watch movies you like, listen to your favourite podcasts or comedy sketches. Comedy sketches are especially useful for this as they tend to only be a couple of minutes long and if they are funny enough they tend to stay in your head anyway and therefore learning those words are a bit easier.
You may also want to consider an English language course if you want to learn better pronunciation in English. Having someone who knows the theory behind how words are pronounced will make it easier for you to learn from them. Look online for courses and more tips to help you develop your pronunciation skills as well as help from other students.
How To Learn Better Pronunciation In English