WhatsApp is a free to download messenger app for smartphones, uses the Internet to send WhatsApp messages, pictures, audio or video. This service is similar to text messaging services, however, WhatsApp uses the Internet to send messages, because the cost of using WhatsApp is far less than texting. You can also use WhatsApp on your desktop, just go to whatsapp website and download it on Mac or Windows. This group is popular with teenagers due to features like chat, voice message and location sharing.
Development of whatsapp
Facebook-owned WhatsApp, now has 1 billion users worldwide and is the largest online messenger app in the market. Started as a small startup established by the former Yahoo! employees in 2009 and 250,000 users reached in just a few months, growing so fast that they could use a service per year to slow down the membership rate. Had to add the fee. In 2014, WhatsApp was acquired on Facebook, and after reaching 1 billion in July 2017, continuous growth was observed.
This group is popular with teenagers due to features like chat, voice message and location sharing.
Using WhatsApp
To use WhatsApp, you need a compatible smartphone or tablet with a SIM card, internet connection, and a phone number. The app uses your phone number as your user name, and your account is locked on the phone, although you can transfer your contacts to new devices However, if WhatsApp is free to use in Ireland, abroad, Whatsapp's website explains:
Please be aware that:
If your phone is roaming, additional mobile data charges may apply. Learn how to configure roaming settings for WhatsApp on Android. iPhone | Windows Phone | Nokia S40 | Blackberry | Blackberry 10 If you send an SMS message to your friends inviting your friends to use WhatsApp, then you can also apply for a service fee from your mobile provider.

Location Sharing and Messaging on WhatsApp
Features of WhatsApp
Whatsapp users can share their location in real time on messages. They can also arrange the list of contacts so that they can send messages to many people in group chat via WhatsApp. Probably the best feature of WhatsApp is that it provides users with the ability to keep in touch with people living abroad, international fees associated with text messages.
Live location tracking

WhatsApp now allows its users to share their location in real time. This feature allows you to share your precise location with friends or share a loved one. This can be useful when you meet friends in a crowded area, or you want to let anyone know that you have come safely to your destination.
To use it for you:
Open the contact you want to share your location, select the + button for iOS, and select the paperclip at the lower left hand of your screen for Android Choose 'Location' when the map is visible 'Share Live location 'option. See this message 'In this chat, participants will see your location in real time. This feature shares your location for the duration even if you are not using the app. You can stop sharing at any time. Then you can decide how you want to share your real time space with this person, you have 15 minutes, 1 hour, or 8 hours option.
It is important to know that you are allowing your movements to be tracked by some other person. Only use this feature with the people you know and trust about. Parents should talk about sharing their child's location and advise against it.
Edit
Watts has also added the ability to delete messages that you sent in error. This can be useful if you sent a message to the wrong contact. The next update for the messaging service will consider adding a 'personal reply' function to the group chat. As of the time of writing, December 2017, it has not been released yet.
Terms and Conditions and Privacy on WhatsApp
The Terms and Conditions of Whatsapp show that users must be at least 13 years of age to use the service. By default, Whatsapp will automatically set your privacy settings, which will allow your WhatsApp user to see your last seen, profile photo and status.
Consider switching this setting to see who can see your profile.
To switch your profile settings, just go to: Menu button> Settings> Account> Privacy You can set the following options to each person (public) in my contacts or any (private) for the privacy of your account.